PC parts / CPU coolers
be quiet!CPU cooler
Silent Loop 3 420mm
Released February 2025.5Reviewclub386.comRead 15 October 2026Club386 states the series debuts on February 25, 2025. Guru3D and FunkyKit state the same sale date. Last checked 15 October 2026.
- Cooler type
- AIO liquid
- Fans
- 3
- Rated TDP
- Not available
- CPU sockets
- AM5, AM4, sTR5, sTR4, LGA1851, LGA1700, LGA1200, LGA1150, LGA1151, LGA1155
36 of 54 fields known.
At a glance
Radiator size
Higher than 96% of other CPU coolers.
Overall performance at 30 dB(A), AM5
Higher than 83% of other CPU coolers.
Overall performance at 30 dB(A), LGA1851
Higher than 83% of other CPU coolers.
General
- Series
- Silent Loop 39Press articleguru3d.com/story/be-quiet-launches-silent-loop-3-series-aio-liquid-cpu-coolersRead 15 October 2026The Silent Loop 3 Series comes in 240, 360 and 420 mm.10Press articlefunkykit.comRead 15 October 2026Press release name: Silent Loop 3, a series of 240, 360 and 420 mm all-in-one coolers.
- Model numbers
- BW02611Retailer pagevoelkner.de/products/13093242/Be-Quiet-Silent-Loop-3-420Mm.htmlRead 15 October 2026Hersteller-Nr. BW026.12Retailer pageldlc.com/en/product/PB00672490.htmlRead 15 October 2026Model BW026.
- Announced
- 11 February 20255Reviewclub386.comRead 15 October 2026Club386 published its review on 11 Feb 2025, the same day as the Guru3D launch report.9Press articleguru3d.com/story/be-quiet-launches-silent-loop-3-series-aio-liquid-cpu-coolersRead 15 October 2026Published 2025-02-11 by Hilbert Hagedoorn.10Press articlefunkykit.comRead 15 October 2026FunkyKit repost of the be quiet! press release, dated 12 February 2025.
- Predecessor
- Not available
- Successor
- Not available
- Launch price (US)
- $174.95Reviewclub386.comRead 15 October 2026MSRP table row Silent Loop 3 420: $174.90 / EUR 174.90. US prices exclude tax.7Reviewtech4gamers.com/be-quiet-silent-loop-3-420-reviewRead 15 October 2026MSRP of USD 174.90 and EUR 174.90.9Press articleguru3d.com/story/be-quiet-launches-silent-loop-3-series-aio-liquid-cpu-coolersRead 15 October 2026$174.90 for 420 mm, $164.90 for 360 mm and $139.90 for 240 mm.10Press articlefunkykit.comRead 15 October 2026Suggested retail price $174.90 for the 420mm.
- Launch price (EU)
- €174.95Reviewclub386.comRead 15 October 2026MSRP table row Silent Loop 3 420: EUR 174.90. The FunkyKit press text gives the same figure.7Reviewtech4gamers.com/be-quiet-silent-loop-3-420-reviewRead 15 October 2026MSRP of EUR 174.90.10Press articlefunkykit.comRead 15 October 2026EUR 174.90 for the 420mm.
- Markets
- US, EU, GB5Reviewclub386.comRead 15 October 2026The review lists US dollar, euro and pound prices (GBP 124.99 in the press text).10Press articlefunkykit.comRead 15 October 2026The press release gives $, EUR and GBP prices (GBP 124.99 for the 420mm).
- Colours
- Black2Reviewaphnetworks.com/reviews/be-quiet-silent-loop-3-420mmRead 15 October 2026General data, Color option: Black.11Retailer pagevoelkner.de/products/13093242/Be-Quiet-Silent-Loop-3-420Mm.htmlRead 15 October 2026Farbe: schwarz.
- Cooler type
- AIO liquid2Reviewaphnetworks.com/reviews/be-quiet-silent-loop-3-420mmRead 15 October 2026Review of the 420mm sealed liquid cooler with pump block, tubes, radiator and three fans.
- Air cooler layout
- Not available
- Rated TDP (claimed)
- Not available
- Base material
- Nickel-plated copper2Reviewaphnetworks.com/reviews/be-quiet-silent-loop-3-420mmRead 15 October 2026APH prints the maker's spec table as read on the maker's website. Base material / finish: copper / nickel plating.3Reviewaphnetworks.com/reviews/be-quiet-silent-loop-3-420mm/2Read 15 October 2026The base contacting the processor is copper with nickel plating.7Reviewtech4gamers.com/be-quiet-silent-loop-3-420-reviewRead 15 October 2026Base on this cooler is nickel-plated copper.
Compatibility
- CPU sockets
- AM5, AM4, sTR5, sTR4, LGA1851, LGA1700, LGA1200, LGA1150, LGA1151, LGA11552Reviewaphnetworks.com/reviews/be-quiet-silent-loop-3-420mmRead 15 October 2026Maker table: Intel 1851 / 1700 / 1200 / 1150 / 1151 / 1155 and AMD AM5 / AM4 / TR5 / TR4. The Threadripper bracket is in the box. LGA1156 is not named, so it is not stored. TR5 and TR4 are stored as sTR5 and sTR4, the names AMD uses for those sockets.4Reviewkitguru.net/components/cooling/james-dawson/be-quiet-silent-loop-3-420-aio-cpu-cooler-reviewRead 15 October 2026Spec list: Intel 1851/1700/1200/115X, AMD AM5 / AM4 / TR5 / TR4. 115X is stored as LGA1150, LGA1151 and LGA1155, which the maker's own table names one by one.7Reviewtech4gamers.com/be-quiet-silent-loop-3-420-reviewRead 15 October 2026Compatible with Intel LGA 115x/1200/1700/1851 and AMD AM4/AM5/TR5/sTRX4/TR4. sTRX4 is not in the maker's table and is not stored.11Retailer pagevoelkner.de/products/13093242/Be-Quiet-Silent-Loop-3-420Mm.htmlRead 15 October 2026Suitable sockets list 1150, 1151, 1155, 1700, 1851, AM4, TR4, sTR5, sTRX4, 1200 and AM5.12Retailer pageldlc.com/en/product/PB00672490.htmlRead 15 October 2026Processor support: AMD AM4, AM5, sTR4, sTR5 and Intel 1150, 1151, 1155, 1200, 1700, 1851.
- RAM height clearance
- Not available
- Offset mounting
- Not available
Heatsink
We could not find any of these 3 fields. Show them
- Heat pipes
- Not available
- Heat pipe diameter
- Not available
- Direct-contact heat pipes
- Not available
Liquid cooling
- Radiator size
- 420mm2Reviewaphnetworks.com/reviews/be-quiet-silent-loop-3-420mmRead 15 October 2026Three 140 mm fans on a 457 mm radiator, so the size class is 420.
- Radiator dimensions
- Length457Width140Thickness27mm(18 × 5.5 × 1.1 in)2Reviewaphnetworks.com/reviews/be-quiet-silent-loop-3-420mmRead 15 October 2026Radiator specifications, Dimensions (H x W x D): 457 x 140 x 27 mm, without fans. The maker's table also prints 475 x 140 x 52 mm for the radiator with fans. Length runs along the fans. Thickness is 27 mm.
- Radiator material
- Aluminium2Reviewaphnetworks.com/reviews/be-quiet-silent-loop-3-420mmRead 15 October 2026Radiator material / finish: aluminum / black spray painted.
- Tube length
- 400mm2Reviewaphnetworks.com/reviews/be-quiet-silent-loop-3-420mmRead 15 October 2026Tube length (mm): 400. APH describes the tubes as rubber with a braided sleeve and measures 400 mm. Tech4Gamers measured 410 mm.7Reviewtech4gamers.com/be-quiet-silent-loop-3-420-reviewRead 15 October 2026Measured 410 mm. The maker's table says 400 mm, which is stored.12Retailer pageldlc.com/en/product/PB00672490.htmlRead 15 October 2026Highlights: flexible 400 mm jacketed hoses.
- Max pump speed
- 3,500rpm2Reviewaphnetworks.com/reviews/be-quiet-silent-loop-3-420mmRead 15 October 2026Pump speed (rpm): 3500, adjustable 1700 - 3500.
- Pump power connector
- 4-pin PWM fan header2Reviewaphnetworks.com/reviews/be-quiet-silent-loop-3-420mmRead 15 October 2026Pump connector: 4-pin PWM.3Reviewaphnetworks.com/reviews/be-quiet-silent-loop-3-420mm/2Read 15 October 2026The pump runs at 1700 to 3500 RPM and is powered and controlled through a 4-pin PWM header.
Fans
- Included fans
Model Size (mm) Fans Max speed (rpm) Airflow (CFM) Static pressure (mmH₂O) Noise (claimed) (dB(A)) Bearing Connector Silent Wings 4 140mm PWM high-speed 140 3 1,900 78.4 2.36 29.3 Fluid dynamic (FDB) 4-pin PWM Source2Reviewaphnetworks.com/reviews/be-quiet-silent-loop-3-420mmRead 15 October 2026Fan model Silent Wings 4 140mm PWM, 140 x 140 x 25 mm, 1900 rpm at 100% PWM, 78.4 CFM, 2.36 mm H2O, FDB, 6-pole motor, 4-pin PWM, 3 fans. The maker's table prints the model without high-speed. The figures match the Silent Wings 4 140mm PWM high-speed fan (BL097). The plain Silent Wings 4 140mm PWM fan spins to 1170 rpm only. The maker's cooler noise row (34.3 dB(A) at 100% rpm, for the whole cooler) is not a per-fan value. The per-fan figure is in the Komputronik entry.3Reviewaphnetworks.com/reviews/be-quiet-silent-loop-3-420mm/2Read 15 October 2026Three Silent Wings 4 140mm PWM fans, seven blades, six-pole motor, fluid dynamic bearings, 2.36 mm H2O and 78.4 CFM. A 3-in-1 Y-adapter joins the fans on one header.4Reviewkitguru.net/components/cooling/james-dawson/be-quiet-silent-loop-3-420-aio-cpu-cooler-reviewRead 15 October 2026Spec list: fan 140 x 140 x 25 mm, 1900 RPM max, 78.4 CFM, 2.36 mmH2O, FDB, 4-pin PWM.13Retailer pagekomputronik.pl/product/771125/be-quiet-silent-wings-4-140mm-pwm-high-speed.htmlRead 15 October 2026Retail copy of the data for the Silent Wings 4 140mm PWM high-speed fan (BL097): 1900 rpm, 78.4 CFM (133.2 m3/h) and a maximum noise of 29.3 dB at full speed. 29.3 dB(A) is stored as the per-fan noise because the maker's cooler table prints 34.3 dB(A) at 100% rpm for the whole cooler with no per-fan label. Three fans at 29.3 dB(A) add up to about 34 dB(A), which fits. The maker's fan data sheet itself is on bequiet.com and was not opened.- Fans
- 3
Display and lighting
- RGB lighting
- Yes5Reviewclub386.comRead 15 October 2026ARGB lighting on the pump block, no RGB on the fans.7Reviewtech4gamers.com/be-quiet-silent-loop-3-420-reviewRead 15 October 2026A-RGB lighting on the pump housing, subtle, synced with motherboard RGB software.9Press articleguru3d.com/story/be-quiet-launches-silent-loop-3-series-aio-liquid-cpu-coolersRead 15 October 2026The cooling block includes addressable RGB lighting.
- Lighting standard
- ARGB 5 V2Reviewaphnetworks.com/reviews/be-quiet-silent-loop-3-420mmRead 15 October 2026Lighting connector: 3 Pin 5V Addressable.4Reviewkitguru.net/components/cooling/james-dawson/be-quiet-silent-loop-3-420-aio-cpu-cooler-reviewRead 15 October 2026Spec list row Pump LED: 3-pin 5v ARGB. Fan LED: N/A.7Reviewtech4gamers.com/be-quiet-silent-loop-3-420-reviewRead 15 October 2026Standard 5V, 3-Pin A-RGB connector on the pump housing.11Retailer pagevoelkner.de/products/13093242/Be-Quiet-Silent-Loop-3-420Mm.htmlRead 15 October 2026LED lighting: addressable RGB header.
- Built-in screen
- None4Reviewkitguru.net/components/cooling/james-dawson/be-quiet-silent-loop-3-420-aio-cpu-cooler-reviewRead 15 October 2026Spec list row LCD Screen: N/A.12Retailer pageldlc.com/en/product/PB00672490.htmlRead 15 October 2026Integrated display: No.
- Screen size
- Not available
- Screen resolution
- Not available
- Software
- Not available
Measured
- Cybenetics THETA, Intel LGA1851
- Silver8Measurementcybenetics.com/evaluations/coolers/84Read 15 October 2026THETA Silver, AIO, rated at 30 dB(A) on a Core Ultra 9 285K with the Default mount.
- Overall performance at 30 dB(A), AM5 (measured)
- 11,2838Measurementcybenetics.com/evaluations/coolers/84Read 15 October 2026Overall Performance 11,283 at 30 dB(A) on a Ryzen 9 7900X (PBO enabled).
- Overall performance at 30 dB(A), LGA1851 (measured)
- 14,1278Measurementcybenetics.com/evaluations/coolers/84Read 15 October 2026Overall Performance 14,127 at 30 dB(A) on a Core Ultra 9 285K (Intel default mode).
- Noise at 100% fan setting (Cybenetics)
- 38dB(A)8Measurementcybenetics.com/evaluations/coolers/84Read 15 October 202638.0 dB(A) at the 100% fan setting (1886, 1880 and 1919 rpm). Hemi-anechoic chamber with a 6 dB(A) noise floor, Bruel & Kjaer 2270 G4 sound analyser, microphone 1 m from the cooler. The protocol keeps the AIO pump at full speed and says the pump noise is not part of the normalized fan-noise levels.
- Thermal tests (measured)
Test CPU Load CPU power (W) Fan setting Noise (dB(A)) CPU temperature (°C) AMD Ryzen 9 7900X Prime95 Small FFTs, full CPU load, PBO enabled 197.1 20 dB(A) 20 91.7 AMD Ryzen 9 7900X Prime95 Small FFTs, full CPU load, PBO enabled 198.7 25 dB(A) 25 90.9 AMD Ryzen 9 7900X Prime95 Small FFTs, full CPU load, PBO enabled 196.5 30 dB(A) 30 91.1 AMD Ryzen 9 7900X Prime95 Small FFTs, full CPU load, PBO enabled 198.9 35 dB(A) 35 90.4 AMD Ryzen 9 7900X Prime95 Small FFTs, full CPU load, PBO enabled 199.1 100% 38 89.5 Intel Core Ultra 9 285K Prime95 Small FFTs, full CPU load, Intel default mode 299.6 20 dB(A) 20 92.2 Intel Core Ultra 9 285K Prime95 Small FFTs, full CPU load, Intel default mode 300.5 25 dB(A) 25 90 Intel Core Ultra 9 285K Prime95 Small FFTs, full CPU load, Intel default mode 299.4 30 dB(A) 30 88.8 Intel Core Ultra 9 285K Prime95 Small FFTs, full CPU load, Intel default mode 298.3 35 dB(A) 35 86.8 Intel Core Ultra 9 285K Prime95 Small FFTs, full CPU load, Intel default mode 298.5 100% 38 78.6 Intel Core i9-13900K Cinebench, 253 W power limit Not available 600 rpm 30.2 89.4 Intel Core i9-13900K Cinebench, 253 W power limit Not available 1200 rpm 34.3 83.5 Intel Core i9-13900K Cinebench, 253 W power limit Not available 1900 rpm (max) 39.4 81.7 Intel Core i9-13900K Cinebench, 153 W power limit Not available 600 rpm 30.2 63.4 Intel Core i9-13900K Cinebench, 153 W power limit Not available 1200 rpm 34.3 61 Intel Core i9-13900K Cinebench, 153 W power limit Not available 1900 rpm (max) 39.4 60.4 Source5Reviewclub386.comRead 15 October 2026Club386 (Damien Mason, 2025-02-11). Intel Core i9-13900K, Cinebench loads at 253 W and 153 W power modes, fans fixed at 600, 1200 and 1900 rpm (maximum). The temperatures are the table values per rpm, which the How We Test page says are CPU-Z averages. Noise is from a Tadeto sound level meter. The 600 rpm noise is published as <30.2 and is stored as 30.2. The ambient temperature, bench or case, paste, meter distance and the pump setting are not stated. The noise table has one column per rpm, so the same noise applies to the 253 W and 153 W rows. The review prints the rows without a Cinebench version in the temperature table.6Reviewclub386.com/how-we-testRead 15 October 2026Cooling section: Core i9-13900K reference CPU, CPU-Z average temperatures, Tadeto sound level meter, Cinebench at 600 rpm, 1,200 rpm and max rpm across 153 W and 253 W modes. Ambient is only said to be kept in line with earlier reviews.8Measurementcybenetics.com/evaluations/coolers/84Read 15 October 2026Cybenetics Cooling Solutions Test Protocol, revision 1.8 procedure. Ambient held at 25 C plus or minus 0.5 C in a climate chamber, open test bench (Cooler Master Test Bench for AM5 with an ASUS TUF Gaming X670E-Plus, DimasTech Bench for LGA1851 with an ASRock Z890 Taichi), Prime95 Small FFTs, pump at full speed in every row. Fans were set to reach each normalized noise level at 1 m, or 100%. CPU power is measured at the EPS connectors. The protocol states Arctic MX-4 paste for all tests. Mount: Default. The report publishes no temperature above ambient. The AM5 rows use the Ryzen 9 7900X with PBO enabled and the LGA1851 rows the Core Ultra 9 285K in Intel default mode. The Intel 35 dB(A) row (86.8 C) and the 100% row (78.6 C) are 8 C apart, while the fans only differ by about 200 rpm. The values are stored as printed.
Dimensions and weight
- Dimensions
- Not available
- Heatsink dimensions
- Not available
- Weight
- 2,010g(4.4 lb)2Reviewaphnetworks.com/reviews/be-quiet-silent-loop-3-420mmRead 15 October 2026Total weight 2.01 kg. Cybenetics lists 2010 g, LDLC 2.01 kg and Tech4Gamers 2010 g. Voelkner's marketplace row of 1.4 kg is not used.7Reviewtech4gamers.com/be-quiet-silent-loop-3-420-reviewRead 15 October 2026Key specs, Net Weight: 2010 gm.12Retailer pageldlc.com/en/product/PB00672490.htmlRead 15 October 2026Weight 2.01 kg.
- Heatsink weight
- Not available
In the box
- In the box
- 1x Intel Backplate, 2x Intel Mounting Brackets, 4x Intel Backplate Screws, 4x Locking Washers / O-Rings, 4x Intel Spacer Nuts, 4x Mounting Brackets Fastening Screws, 1x AMD TR4/TR5 Mounting Bracket, 1x set of AMD AM4/AM5 Mounting Brackets, 4x AMD Screws, 4x AMD Spacers, 12x Radiator Screws, 12x Fan Screws, 1x Thermal Paste Tube, 3x Zip Ties, 1x Refill Coolant Bottle 100ml, 1x 3-way PWM Splitter Cable, 1x User Manual, 1x Safety Paper7Reviewtech4gamers.com/be-quiet-silent-loop-3-420-reviewRead 15 October 2026Packing and unboxing list copied in full: 18 lines, from the Intel backplate to the safety paper.
Links
- Product page
- www.bequiet.com/en/watercooler/silent-loop-3/53951Maker product pagebequiet.com/en/watercooler/silent-loop-3/5395Read 15 October 2026The URL is the Silent Loop 3 series page from the job's selection step and from a search result. The page was not opened because bequiet.com is blocked. No value rests on it.
- Spec sheet
- Not available
- Manual
- Not available
- EPREL registration number
- Not available
Warranty
- Manufacturer warranty (source market)
- 3years2Reviewaphnetworks.com/reviews/be-quiet-silent-loop-3-420mmRead 15 October 2026Service, Warranty (Years): 3.5Reviewclub386.comRead 15 October 2026Three-year warranty for every size.9Press articleguru3d.com/story/be-quiet-launches-silent-loop-3-series-aio-liquid-cpu-coolersRead 15 October 2026A three-year warranty is included.
Compare with
Pick a CPU cooler to see both side by side. Differences are marked yellow.
Sources
We read 13 sources for this CPU cooler. The numbers match the markers in the sheet.
- Maker product pagebequiet.com/en/watercooler/silent-loop-3/5395
- Reviewclub386.com
- Reviewclub386.com/how-we-test
- Measurementcybenetics.com/evaluations/coolers/84
- Press articlefunkykit.com
- Retailer pageldlc.com/en/product/PB00672490.html
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