CPU coolers / Compare

DeepCool AK400 G2 vs Thermalright Peerless Assassin 140 SE

A

Product A: DeepCool

AK400 G2

29 of 54 known

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B

Product B: Thermalright

Peerless Assassin 140 SE

22 of 54 known

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Every value links to where we found it.

Only differences

ADeepCool AK400 G2

BThermalright Peerless Assassin 140 SE

General

8 of 12 differ

Series

AK G25Press releaseglobal.deepcool.com/company/pressroom/newsrelease/2025/22352.shtmlRead 15 October 2026The release names the family AK G2 with 4, 5 and 6 heat pipe models.

Peerless Assassin1Maker product pagethermalright.com/product/peerless-assassin-140-seRead 15 October 2026Category: Peerless Assassin.

Model numbersiMaker identifiers for this exact model and its listed variants. Excludes sibling models and other generations.

R-AK400G2-BKNNMN-GJD, R-AK400G2-WHNNMN-GJD1Maker product pagedeepcool.com/products/Cooling/cpuaircoolers/AK400-G2-Wood-Grain-Top-Cover-CPU-Cooler/2025/21908.shtmlRead 15 October 2026Black: P/N R-AK400G2-BKNNMN-GJD. The white page 21909 gives R-AK400G2-WHNNMN-GJD. The AK400 G2 DIGITAL NYX is a separate model with its own page and is not this product.2Maker product pagedeepcool.com/products/Cooling/cpuaircoolers/AK400-G2-WH-Wood-Grain-Top-Cover-CPU-Cooler/2025/21909.shtmlRead 15 October 2026White: P/N R-AK400G2-WHNNMN-GJD.

Not available

GTIN / EAN

6933412729655, 69334127296621Maker product pagedeepcool.com/products/Cooling/cpuaircoolers/AK400-G2-Wood-Grain-Top-Cover-CPU-Cooler/2025/21908.shtmlRead 15 October 2026Black EAN 6933412729655. The white page gives EAN 6933412729662.2Maker product pagedeepcool.com/products/Cooling/cpuaircoolers/AK400-G2-WH-Wood-Grain-Top-Cover-CPU-Cooler/2025/21909.shtmlRead 15 October 2026White EAN 6933412729662.

0814256022088, 08142560220956Retailer pageregard.ru/product/777593/kuler-thermalright-peerless-assassin-140-seRead 15 October 2026Alternative name 814256022088, stored as the 13 digit 0814256022088. Komputronik gives the same EAN.7Retailer pagekomputronik.pl/product/1000573/thermalright-peerless-assassin-140-se.htmlRead 15 October 2026Plain edition: EAN 814256022088. Amazon US listings carry another code, 739538428641, for a PA140SE-D2 listing. It is not stored because it is not on a Thermalright-prefix code and its pairing is unclear.8Retailer pagekomputronik.pl/product/1000574/thermalright-peerless-assassin-140-se-argb.htmlRead 15 October 2026ARGB edition: EAN 814256022095, stored as 0814256022095. It follows the plain edition's number.

AnnouncediThe maker's first announcement of this model. This is separate from first retail availability.

4 November 20255Press releaseglobal.deepcool.com/company/pressroom/newsrelease/2025/22352.shtmlRead 15 October 2026Press release dated November 4, 2025 for the AK G2 series.6Press articlekitguru.net/components/cooling/matthew-wilson/deepcool-debuts-2nd-gen-ak-and-ak-digital-cpu-coolersRead 15 October 2026Article of November 4, 2025.

Not available

Status

Available11Retailer pagearvutitark.ee/en/pc-components/coolers/protsessori-jahutid/k-cooler-deepcool-ak400-g2-1511621Read 15 October 2026Arvutitark (Estonia) lists the black model at 37.90 EUR with 47 pieces available to order on the access date. DeepCool's page is live and Tom's Hardware says the coolers are not easy to buy in the US.

Available1Maker product pagethermalright.com/product/peerless-assassin-140-seRead 15 October 2026The page is live and retailers list the cooler.

PredecessoriThe model this one directly replaced, in the same line, tier and size, as the maker or a trusted review names it.

Not available

Not available

SuccessoriThe model that directly replaced this one, in the same line, tier and size. A revision such as a Slim or OLED model does not count when a next generation exists.

Not available

Not available

Launch price (US)iThe maker's US launch MSRP for the stated configuration, excluding tax. Current store prices and later discounts do not qualify.

Not available

Not available

Launch price (EU)iThe maker's euro launch price for the stated configuration, including VAT as published. Current store prices and later discounts do not qualify.

€39.996Press articlekitguru.net/components/cooling/matthew-wilson/deepcool-debuts-2nd-gen-ak-and-ak-digital-cpu-coolersRead 15 October 2026The standard edition AK G2 models in black and white are priced at EUR 39.99 for the AK400 G2. Funkykit reports the same EUR 39.99 for the AK400 G2 (WH). The price includes VAT and the report names no country. The DeepCool release gives no prices.7Press articlefunkykit.com/news/deepcool-also-introduces-new-ak-g2-cpu-air-coolersRead 15 October 2026MSRP AK400 G2 (WH) EUR 39.99.

Not available

MarketsiISO country or region codes where this exact model or variant is sold. A source page's language does not establish availability.

Not available

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ColoursiThe maker's own colour names

Black, White1Maker product pagedeepcool.com/products/Cooling/cpuaircoolers/AK400-G2-Wood-Grain-Top-Cover-CPU-Cooler/2025/21908.shtmlRead 15 October 2026Black on this page. White on the AK400 G2 WH page 21909 with identical specs.2Maker product pagedeepcool.com/products/Cooling/cpuaircoolers/AK400-G2-WH-Wood-Grain-Top-Cover-CPU-Cooler/2025/21909.shtmlRead 15 October 2026White edition with the same technical spec table.9Reviewtomshardware.com/pc-components/air-cooling/deepcool-ak620-and-ak400-g2-review-quiet-and-powerful-with-woodgrain-or-a-digital-displayRead 15 October 2026Black or white, with woodgrain or digital display options. The review says the AK400 G2 does not overhang the DIMM slots, so all RAM heights fit. Retailers print 40 mm or 60 mm RAM clearance and conflict, so no clearance is stored.

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Cooler typeiAir is a heatsink with fans that sits on the CPU. AIO liquid is a sealed all-in-one liquid cooler with a pump block, tubes and a radiator.

Air1Maker product pagedeepcool.com/products/Cooling/cpuaircoolers/AK400-G2-Wood-Grain-Top-Cover-CPU-Cooler/2025/21908.shtmlRead 15 October 2026Air cooler with one 120 mm fan.

Air1Maker product pagethermalright.com/product/peerless-assassin-140-seRead 15 October 2026

Air cooler layoutiAir coolers only. Top-flow covers low-profile coolers whose fan blows down onto the board.

Single tower1Maker product pagedeepcool.com/products/Cooling/cpuaircoolers/AK400-G2-Wood-Grain-Top-Cover-CPU-Cooler/2025/21908.shtmlRead 15 October 2026Text: a single-tower heat sink with four heat pipes.9Reviewtomshardware.com/pc-components/air-cooling/deepcool-ak620-and-ak400-g2-review-quiet-and-powerful-with-woodgrain-or-a-digital-displayRead 15 October 2026Single-tower AK400 G2.

Dual tower1Maker product pagethermalright.com/product/peerless-assassin-140-seRead 15 October 2026Listed under Dual Towers in the Peerless Assassin series.

Rated TDP (claimed)iThe heat load the maker says the cooler handles. Makers do not share one test method, so this is not a measured result. A maker's maximum heat dissipation power counts. Check the maker's CPU compatibility page too.

240W3Maker product pagedeepcool.com/ProductCompatibilityS_New/Default.aspxRead 15 October 2026Thermal Design Power (TDP) and CPU Socket Compatibility List: AK400 G2 240 W, and the same for AK400 G2 WH.

Not available

Base materialiThe surface that touches the CPU: the heatsink base or the AIO cold plate. Plating counts, so nickel-plated copper is not copper. Direct-touch heat pipes are the contact surface, so they count as copper unless plating is stated. The direct-contact heat pipes field records the design.

Copper1Maker product pagedeepcool.com/products/Cooling/cpuaircoolers/AK400-G2-Wood-Grain-Top-Cover-CPU-Cooler/2025/21908.shtmlRead 15 October 2026Text: four direct touch copper heat pipes. The page names no base plate or plating, so the contact surface is stored as copper.

Nickel-plated copper1Maker product pagethermalright.com/product/peerless-assassin-140-seRead 15 October 2026Copper Base: C1100 Pure copper nickel plated.

Thermal pasteiPre-applied means paste is already on the base or cold plate. Included means a separate tube or syringe in the box.

Pre-applied9Reviewtomshardware.com/pc-components/air-cooling/deepcool-ak620-and-ak400-g2-review-quiet-and-powerful-with-woodgrain-or-a-digital-displayRead 15 October 2026Package list: the AK400 G2 includes pre-installed thermal paste, while the AK620 G2 includes a tube.

Included2Owner's manualdownload.thermalright.com/manuals/PEERLESSASSASSIN140SE.pdfRead 15 October 2026Parts list item L: Thermal Grease x1 (printed Greasa). The steps say to apply thermal compound on the CPU and to remove the protective film from the copper base.

Compatibility

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CPU socketsiSockets the maker lists as supported in its spec table, compatibility list or guide, written as cpu_socket writes them, e.g. AM5 or LGA1851. List each socket on its own, so LGA115x becomes LGA1150, LGA1151, LGA1155 and LGA1156. When the maker names the sockets of such a family, list only the ones it names. A socket that needs a separately sold or requested mounting kit is left out. A new socket that the maker lists with no extra kit counts. LGA2011-v3 and 2011(V3) are written LGA2011-3. Threadripper sockets use AMD's names, so TR4 is written sTR4 and TR5 is written sTR5. sTRX4 and sWRX8 are sockets of their own.

AM5, AM4, LGA1851, LGA1700, LGA1200, LGA1155, LGA1151, LGA11501Maker product pagedeepcool.com/products/Cooling/cpuaircoolers/AK400-G2-Wood-Grain-Top-Cover-CPU-Cooler/2025/21908.shtmlRead 15 October 2026Application for Intel LGA1851/1700/1200/115X and AMD AM5/AM4. The manual names LGA1200, LGA1151, LGA1150 and LGA1155 for the 115X family, so LGA1156 is not stored.3Maker product pagedeepcool.com/ProductCompatibilityS_New/Default.aspxRead 15 October 2026The row marks LGA1851, LGA1700, LGA1200, LGA115X and AM5, AM4 and no LGA20XX or Threadripper sockets.4Owner's manualdeepcool.com/download/pdf/AK400_G2_Series.pdfRead 15 October 2026Installation chapters: Intel LGA1851/1700, Intel LGA1200/1151/1150/1155 and AMD AM5/AM4.9Reviewtomshardware.com/pc-components/air-cooling/deepcool-ak620-and-ak400-g2-review-quiet-and-powerful-with-woodgrain-or-a-digital-displayRead 15 October 2026Spec table: AMD AM5/AM4 and Intel 1700/1851/1200/115x.11Retailer pagearvutitark.ee/en/pc-components/coolers/protsessori-jahutid/k-cooler-deepcool-ak400-g2-1511621Read 15 October 2026Sockets supported: 1150, 1151, 1155, 1200, 1700, 1851, AM4, AM5.

AM5, AM4, LGA1851, LGA1700, LGA1200, LGA1156, LGA1155, LGA1151, LGA11501Maker product pagethermalright.com/product/peerless-assassin-140-seRead 15 October 2026Intel LGA115X/1200/1700/1851 and AMD AM4/AM5. LGA115X is written as LGA1150, LGA1151, LGA1155 and LGA1156.2Owner's manualdownload.thermalright.com/manuals/PEERLESSASSASSIN140SE.pdfRead 15 October 2026Install sections for AM4/AM5, Intel LGA115X/1200 and Intel LGA1700/1851.

RAM height clearanceiAir coolers only. The tallest memory module that fits under the cooler with all included fans in their standard position. When the maker gives different values per socket, store the lowest and name the others in the source note. A heatsink that does not reach over the memory slots has no height limit, so the field is left out and the maker's statement goes in the source note.

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Offset mountingiThe included mount can shift the base or cold plate off the socket centre, for example toward the AM5 hotspot. An asymmetric heatsink on a centred base does not count.

No5Press releaseglobal.deepcool.com/company/pressroom/newsrelease/2025/22352.shtmlRead 15 October 2026The list of features marks the offset mounting solution with For AK620 G2 only, and the text says it is exclusive to the AK620 G2, so the AK400 G2 has none. The offset heat pipes on the AK400 G2 page describe the heat pipe layout, not a shifted mount.

Not available

Heatsink

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Heat pipesiAir coolers only. Number of heat pipes. A U-shaped pipe with two ends in the fins counts as one. A T-shaped pipe with three ends, such as Cooler Master's 3DHP, also counts as one. The maker's count wins over a review or Cybenetics count.

41Maker product pagedeepcool.com/products/Cooling/cpuaircoolers/AK400-G2-Wood-Grain-Top-Cover-CPU-Cooler/2025/21908.shtmlRead 15 October 2026Heatpipe: 4 pcs, 6 mm.5Press releaseglobal.deepcool.com/company/pressroom/newsrelease/2025/22352.shtmlRead 15 October 2026The release names models with 4, 5 and 6 heat pipes. The AK400 G2 is the four heat pipe model.9Reviewtomshardware.com/pc-components/air-cooling/deepcool-ak620-and-ak400-g2-review-quiet-and-powerful-with-woodgrain-or-a-digital-displayRead 15 October 2026Four slightly staggered direct-touch copper heat pipes.

61Maker product pagethermalright.com/product/peerless-assassin-140-seRead 15 October 2026Heat pipes: 6mm heatpipe x 6 units.

Heat pipe diameteriAir coolers only. Outer diameter, such as 6 or 8.

6mm1Maker product pagedeepcool.com/products/Cooling/cpuaircoolers/AK400-G2-Wood-Grain-Top-Cover-CPU-Cooler/2025/21908.shtmlRead 15 October 2026Heatpipe: diameter 6 mm x 4 pcs.

6mm1Maker product pagethermalright.com/product/peerless-assassin-140-seRead 15 October 2026Heat pipes: 6mm heatpipe x 6 units.

Direct-contact heat pipesiAir coolers only. The heat pipes touch the CPU directly instead of sitting in a solid base plate.

Yes1Maker product pagedeepcool.com/products/Cooling/cpuaircoolers/AK400-G2-Wood-Grain-Top-Cover-CPU-Cooler/2025/21908.shtmlRead 15 October 2026Text: four direct touch copper heat pipes.9Reviewtomshardware.com/pc-components/air-cooling/deepcool-ak620-and-ak400-g2-review-quiet-and-powerful-with-woodgrain-or-a-digital-displayRead 15 October 2026Four direct-touch copper heat pipes embedded in the base.

No1Maker product pagethermalright.com/product/peerless-assassin-140-seRead 15 October 2026The page lists a copper base. The blueprint shows the heat pipes entering a base block. No direct touch design is claimed.

Liquid cooling

None of 7 known

Radiator sizeiAIO coolers only. The nominal size class from the fan positions, such as 240, 280, 360 or 420.

Not available

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Radiator dimensionsiRadiator without fans. Length runs along the row of fans. Width runs across it. Thickness is the depth the airflow passes through, such as 27 or 38.

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Radiator material

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Tube lengthiLength of each tube between the pump block and the radiator, as published. When the two tubes differ, the shorter is stored and the other goes in the source note.

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Max pump speediHighest rated pump speed. When the maker gives a range, this is its top.

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Pump power connectoriHow the pump gets power. A pump wired through a supplied hub or cable uses the plug at the motherboard or PSU end. A pump powered from SATA with a separate 3-pin speed lead is SATA power.

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VRM faniA small fan on the pump block that blows over the motherboard voltage regulators.

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Fans

2 of 2 differ

Included fansiFans in the box that cool the heatsink or radiator, one row per fan model. A VRM fan on the pump block is left out. Speed, airflow, pressure and noise are the maker's figures for one fan at full speed, in the fastest mode and without a low-noise adapter. When a range is published, the top of the range is stored. Count is the number of rotors, so a unified frame with three 120 mm rotors counts 3 with size 120. Min speed is the lowest speed while spinning. A zero RPM stop is not stored. FDB and S-FDB are fluid dynamic. HDB is hydrodynamic. Cooler Master's Loop Dynamic Bearing is loop dynamic. If the maker gives airflow only in m³/h, convert with 1 m³/h = 0.5886 CFM, round to one decimal and say so in the source note. Connector is the fan's power lead. A separate lighting lead is not counted, and a maker cable or adapter in the box that ends in a 4-pin PWM plug counts as 4-pin PWM, even when the fan's own lead is proprietary. For an air cooler with one fan, the maker's noise figure for the cooler is the fan noise. A figure the maker does not label per fan or in total counts as per fan. When a maker table prints noise for the whole cooler with no per-fan label and the maker's own data sheet for the same fan gives a figure, the fan data sheet figure is stored.

ADeepCool AK400 G2

Size (mm)	Fans	Max speed (rpm)	Airflow (CFM)	Static pressure (mmH₂O)	Noise (claimed) (dB(A))	Bearing	Connector
120	1	2,200	63.4	3.33	31.45	Hydraulic	4-pin PWM

Source1Maker product pagedeepcool.com/products/Cooling/cpuaircoolers/AK400-G2-Wood-Grain-Top-Cover-CPU-Cooler/2025/21908.shtmlRead 15 October 2026Technical spec: fan 120 x 120 x 25 mm, speed 2200 +/-10% rpm (max), airflow 63.4 CFM, air pressure 3.33 mmAq (read as mmH2O), noise <= 31.45 dB(A), 4-pin PWM, hydro bearing (the text says hydraulic bearing), 12 VDC 0.25 A. One fan is in the box, per the manual. The page gives no fan model name. The page also says 0 RPM startup and stop below 5% PWM, which is not stored as a minimum speed.4Owner's manualdeepcool.com/download/pdf/AK400_G2_Series.pdfRead 15 October 2026Parts page: one fan (B x1) and two fan clips.9Reviewtomshardware.com/pc-components/air-cooling/deepcool-ak620-and-ak400-g2-review-quiet-and-powerful-with-woodgrain-or-a-digital-displayRead 15 October 2026Review states the fan is essentially the same model as on the AK620 G2, 2200 rpm +/-10%, 63.4 CFM, 3.33 mmAq.

BThermalright Peerless Assassin 140 SE

Model	Size (mm)	Fans	Max speed (rpm)	Airflow (CFM)	Static pressure (mmH₂O)	Noise (claimed) (dB(A))	Bearing	Connector
TL-C12C-X28 V2	120	1	1,850	88.89	2.21	29.5	Fluid dynamic (FDB)	4-pin PWM
TL-D14CB	140	1	1,500	77.8	2.09	25.6	Fluid dynamic (FDB)	4-pin PWM

Source1Maker product pagethermalright.com/product/peerless-assassin-140-seRead 15 October 2026Two fan spec tables. TL-C12C-X28 V2: 120 x 120 x 28 mm, 1850 RPM +/-10% max, 29.5 dBA, 88.89 CFM max, 2.21 mm H2O max, 4 pin PWM, S-FDB bearing. TL-D14CB: 140 x 140 x 27 mm, 1500 RPM +/-10% max, 25.6 dBA, 77.8 CFM max, 2.09 mm H2O max, 4 pin PWM, S-FDB bearing. S-FDB is stored as fluid dynamic. No minimum speed is published. The manual shows one fan of each size.2Owner's manualdownload.thermalright.com/manuals/PEERLESSASSASSIN140SE.pdfRead 15 October 2026Parts list: 120mm FAN x1, 140mm FAN x1, 120mm FAN Clip x2, 140mm FAN Clip x2, FAN Y Cable x1.

FansiNumber of included heatsink or radiator fans.

1=CalculatedFrom Included fans

2=CalculatedFrom Included fans

Display and lighting

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RGB lightingiLighting on the fans, the heatsink or the pump block.

No9Reviewtomshardware.com/pc-components/air-cooling/deepcool-ak620-and-ak400-g2-review-quiet-and-powerful-with-woodgrain-or-a-digital-displayRead 15 October 2026Spec table: Lighting None.

No6Retailer pageregard.ru/product/777593/kuler-thermalright-peerless-assassin-140-seRead 15 October 2026Retailer spec table, Lighting: none. Thermalright's fan tables list no LED line for the plain edition.

Lighting standardiThe named lighting connection. ARGB lighting alone does not prove a 5 V header. Proprietary means the maker's own hub or cable system.

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Built-in screeniA screen on the pump block or the heatsink. LCD and OLED screens show images. A segment readout shows digits only, such as the CPU temperature.

None9Reviewtomshardware.com/pc-components/air-cooling/deepcool-ak620-and-ak400-g2-review-quiet-and-powerful-with-woodgrain-or-a-digital-displayRead 15 October 2026The wood-grain AK400 G2 has no screen. The digital display is on the separate Digital NYX models.

None1Maker product pagethermalright.com/product/peerless-assassin-140-seRead 15 October 2026The page lists a heatsink and fans only. No screen is mentioned.

Screen sizeiDiagonal of the built-in screen.

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Screen resolution

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SoftwareiThe maker's software for lighting, the screen or the pump. Software that works with the cooler out of the box. Software that needs a separately sold controller is left out.

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Needs a USB headeriThe cooler needs an internal USB 2.0 header on the motherboard for software control, sensors or the screen. A wireless receiver that plugs into any USB port does not count.

Not available

No2Owner's manualdownload.thermalright.com/manuals/PEERLESSASSASSIN140SE.pdfRead 15 October 2026The wiring note shows only the 4-pin PWM CPU FAN header and says to use the Y cable for two fans. No USB connection is shown.

Measured

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Cybenetics THETA, AMD AM5iThe THETA level for this cooler's class on the Cybenetics AMD AM5 platform with a Ryzen 9 7900X. It is rated at 30 dB(A) normalized noise, or at 25 dB(A) for a cooler that cannot reach 30 dB(A). No level means tested without a level. A cooler that Cybenetics did not test on this platform is left out. A report with a heading for this platform but no results counts as not tested.

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Cybenetics THETA, Intel LGA1851iThe same rating on the Cybenetics Intel LGA1851 platform with a Core Ultra 9 285K. A cooler that Cybenetics did not test on this platform is left out. A report with a heading for this platform but no results counts as not tested.

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Overall performance at 30 dB(A), AM5 (measured)iThe Cybenetics Overall Performance score at 30 dB(A) normalized noise on the AMD AM5 platform. It is average CPU power times average CPU frequency divided by average CPU temperature. Higher is better. A cooler rated only at 25 dB(A) has no value here.

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Overall performance at 30 dB(A), LGA1851 (measured)iThe same score on the Cybenetics Intel LGA1851 platform. Scores from the two platforms are not comparable with each other.

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Noise at 100% fan setting (Cybenetics)iThe Cybenetics noise at the 100% fan setting, measured 1 m from the cooler in a hemi-anechoic chamber, with the pump of an AIO at full speed. Other reviewers' noise goes in the thermal test rows.

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Thermal tests (measured)iReviewer results, one row per test condition. Rows compare only when the test CPU, load, power and noise level match. The source note names the reviewer, ambient temperature, case or open bench, and thermal paste. Test CPU is the CPU name only, such as AMD Ryzen 9 7900X. The power limit and mode go in the load. Above ambient is stored only when the reviewer publishes it, never computed from the ambient.

ADeepCool AK400 G2

Test CPU	Load	CPU power (W)	Fan setting	Noise (dB(A))	Above ambient (°C)
AMD Ryzen 9 9950X3D	Cinebench R23 multi-core, PBO enabled, closed case, average CPU power the cooler held	244.2	maximum	41.9	Not available
AMD Ryzen 9 9950X3D	Cinebench R23 multi-core, 200 W stock power limit, closed case	200	Not available	Not available	55.9
AMD Ryzen 9 9950X3D	Cinebench R23 multi-core with a 150 W power limit and Furmark on a GPU at 295 W, closed case	150	default motherboard fan curve	38.9	45.9
AMD Ryzen 9 9950X3D	Cinebench R23 multi-core, PBO enabled, closed case, noise-normalized test, average CPU power the cooler held	233.2	38.9 dB(A)	38.9	Not available
AMD Ryzen 9 9950X3D	Karhu RAM stress test, about 153 W on the CPU, 30-minute run, closed case	153	Not available	Not available	39.5

Source10Reviewtomshardware.com/pc-components/air-cooling/deepcool-ak620-and-ak400-g2-review-quiet-and-powerful-with-woodgrain-or-a-digital-display/2Read 15 October 2026Tom's Hardware, Albert Thomas, review of 11 August 2026, values read from the bar charts. Ryzen 9 9950X3D on an MSI X870E Carbon WiFi in a closed Tryx Flova F50 case with one Noctua NF-A12 G2 intake fan and an RTX 4070 Ti Super, ambient 22 C. Paste is not stated. The temperature limit is 95 C, which every PBO air cooler reached in the maximum test, and the review gives no temperature for it. Row 1: average power with PBO, 244.2 W, with 41.9 dBA from the maximum noise chart (Pyle PSPL25 meter, distance not stated, the chart shows AK620 G2 at 42.4). Row 2: the 200 W stock limit, 55.9 C above ambient, no noise chart. Row 3: 150 W CPU with Furmark on the GPU at 295 W, 45.9 C above ambient, noise 38.9 dBA at the default fan curve of the motherboard. Row 4: noise normalized to 38.9 dBA, 233.2 W cooled. Row 5: Karhu test, 39.5 C above ambient for the CPU, no noise chart.

BThermalright Peerless Assassin 140 SE

Not available

Dimensions and weight

4 of 4 differ

DimensionsiAir coolers only. The cooler with its included fans in the standard position, without the mounting kit. Height runs from the bottom of the base to the top. Depth runs along the airflow, fans included. Width runs across the fins. Map by direction, not by letter. Width runs across the fins, depth runs along the airflow. DeepCool's 129 x 138 x 160 mm (L x W x H) is width 129, depth 138, height 160.

Width132Height156Depth92mm(5.2 × 6.1 × 3.6 in)1Maker product pagedeepcool.com/products/Cooling/cpuaircoolers/AK400-G2-Wood-Grain-Top-Cover-CPU-Cooler/2025/21908.shtmlRead 15 October 2026Product Dimensions 132 x 92 x 156 mm (L x W x H), read as width 132, depth 92, height 156 by the DeepCool rule in the dimensions help. Arvutitark and a Czech distributor print the same 156 mm and 92 mm figures.11Retailer pagearvutitark.ee/en/pc-components/coolers/protsessori-jahutid/k-cooler-deepcool-ak400-g2-1511621Read 15 October 2026Cooler height 156 mm and 151 mm.

Width140Height158Depth160mm(5.5 × 6.2 × 6.3 in)1Maker product pagethermalright.com/product/peerless-assassin-140-seRead 15 October 2026The blueprint on the page shows 140 mm across, 158 mm high and 160 mm deep with the fans fitted. Width 140 is the front view, depth 160 is the side view.5Retailer pageldlc.com/en/product/PB00744007.htmlRead 15 October 2026LDLC lists fan included: height 158, width 160 and depth 140 mm. Its width is the 160 mm along the airflow and its depth is the 140 mm across the fins, so it matches the maker blueprint. LDLC wrongly says both fans are 140 mm.6Retailer pageregard.ru/product/777593/kuler-thermalright-peerless-assassin-140-seRead 15 October 2026Size (W x H x D) 140 x 158 x 160 mm.

Heatsink dimensionsiAir coolers only. The heatsink without fans, as the maker lists it. Map by direction, not by letter. Width runs across the fins, depth runs along the airflow. DeepCool's 129 x 138 x 160 mm (L x W x H) is width 129, depth 138, height 160. A heatsink depth that equals the depth with fans includes the fan, so that axis is not stored.

Width130Height151mm(5.1 × 5.9 in)1Maker product pagedeepcool.com/products/Cooling/cpuaircoolers/AK400-G2-Wood-Grain-Top-Cover-CPU-Cooler/2025/21908.shtmlRead 15 October 2026Heatsink Dimensions 130 x 92 x 151 mm (L x W x H). Width 130 and height 151 are stored. The depth of 92 mm equals the product depth with the fan, although the 25 mm fan sits in front of the fins, so the heatsink depth is not stored.

Width140Height158Depth132mm(5.5 × 6.2 × 5.2 in)1Maker product pagethermalright.com/product/peerless-assassin-140-seRead 15 October 2026Heatsink Specifications: L140 mm x W132 mm x H158 mm. L runs across the fins and W along the airflow of this dual-tower cooler, so width 140, depth 132 and height 158. The page does not say whether the fans are included. The blueprint is 160 mm deep with the 28 mm front fan, which is 132 plus 28, so this is the heatsink alone.

WeightiAn air cooler with its included fans. An AIO cooler as one unit with pump block, tubes, radiator and fans. Mounting hardware is left out when the maker states it separately. When one maker figure may include the mounting kit, such as a press release net weight above the product page figure, the product page figure is stored. An RGB edition can weigh a little more or less, so it is per variant.

950g(2.1 lb)1Maker product pagedeepcool.com/products/Cooling/cpuaircoolers/AK400-G2-Wood-Grain-Top-Cover-CPU-Cooler/2025/21908.shtmlRead 15 October 2026Net Weight 950 g.2Maker product pagedeepcool.com/products/Cooling/cpuaircoolers/AK400-G2-WH-Wood-Grain-Top-Cover-CPU-Cooler/2025/21909.shtmlRead 15 October 2026Net Weight 950 g, same as the black page.

Not available

Heatsink weightiAir coolers only. The heatsink without fans.

Not available

840g(1.9 lb)4Press articleguru3d.com/story/thermalright-expands-peerless-assassin-series-with-v3-twintower-air-coolersRead 15 October 2026Spec table: weight 840 g without fans, 132 x 140 x 158 mm. xcom-shop.ru lists 900 g, which is lower than 840 g plus two fans, so it is not a heatsink or total weight and is not stored. No source gives the weight with fans.

In the box

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In the boxiItems supplied with this exact model, verbatim.

Mounting hardware for AMD and Intel platforms, Alternative top cover, 120 mm fan and fan clips, Installation manual4Owner's manualdeepcool.com/download/pdf/AK400_G2_Series.pdfRead 15 October 2026Parts pages: heatsink x1, fan x1, Intel backplate x1, bracket x1, fan clips x2 and the Intel and AMD standoffs and screws x4 each. The alternative top cover and manual come from the Tom's Hardware package list.9Reviewtomshardware.com/pc-components/air-cooling/deepcool-ak620-and-ak400-g2-review-quiet-and-powerful-with-woodgrain-or-a-digital-displayRead 15 October 2026Package list: mounting hardware for AMD and Intel platforms, alternative top covers, 120 mm fans and fan clips and the installation manual. The screwdriver is for the AK620 G2 only. Wording is shortened from the list.

Heatsink x1, 120mm FAN x1, 140mm FAN x1, Backplate x1, INTEL Bracket x2, AM4/AM5 Bracket x2, 120mm FAN Clip x2, 140mm FAN Clip x2, 1200 Standoffs x4, INTEL Screw x4, FAN Y Cable x1, AM4/AM5 Standoffs x4, AM4/AM5 Screw x4, Thermal Grease x1, 1700 Standoffs x42Owner's manualdownload.thermalright.com/manuals/PEERLESSASSASSIN140SE.pdfRead 15 October 2026Parts list items A to M, quantities as printed, with a missing space in the 140mm fan clip line restored. The printed AM4/AM5 standoff line has no item letter in the text layer. The Chinese list names item J as AM4 standoffs.

Links

Not compared

Product page

www.deepcool.com/products/Cooling/cpuaircoolers/AK400-G2-Wood-Grain-Top-Cover-CPU-Cooler/2025/21908.shtml1Maker product pagedeepcool.com/products/Cooling/cpuaircoolers/AK400-G2-Wood-Grain-Top-Cover-CPU-Cooler/2025/21908.shtmlRead 15 October 2026

www.thermalright.com/product/peerless-assassin-140-se1Maker product pagethermalright.com/product/peerless-assassin-140-seRead 15 October 2026

Spec sheet

Not available

Not available

Manual

www.deepcool.com/download/pdf/AK400_G2_Series.pdf4Owner's manualdeepcool.com/download/pdf/AK400_G2_Series.pdfRead 15 October 2026AK400 G2 Series wood grain top cover manual, 24 pages, mostly drawings (read with OCR and by eye).

download.thermalright.com/manuals/PEERLESSASSASSIN140SE.pdf2Owner's manualdownload.thermalright.com/manuals/PEERLESSASSASSIN140SE.pdfRead 15 October 2026

EPREL registration numberiId in the EU energy label database. Each size or model of a series has its own id, so it is per variant.

Not available

Not available

Warranty

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Manufacturer warranty (source market)iThe maker's warranty period for the exact SKU or configuration and market named in the source note. It applies only to that stated market, not every regional variant. Statutory consumer rights are excluded. The base term is stored. An extension that needs registration goes in the source note.

3years1Maker product pagedeepcool.com/products/Cooling/cpuaircoolers/AK400-G2-Wood-Grain-Top-Cover-CPU-Cooler/2025/21908.shtmlRead 15 October 20263 Years Limited Warranty Coverage. The page names no market.5Press releaseglobal.deepcool.com/company/pressroom/newsrelease/2025/22352.shtmlRead 15 October 2026Three-year warranty.9Reviewtomshardware.com/pc-components/air-cooling/deepcool-ak620-and-ak400-g2-review-quiet-and-powerful-with-woodgrain-or-a-digital-displayRead 15 October 2026Spec table: 3 years.

Not available

Both are also in the API. Back to all CPU coolers.