Be quiet! Dark Rock 4 CPU Cooler

65.47 GBP 6% Off 69.98 GBP

A single‑tower CPU cooler with a 135 mm Silent Wings fan, six copper heatpipes, aluminium fins and ceramic‑coated black finish, handling up to 200 W TDP while staying quiet at 10.5–21.4 dB; PWM‑controlled with a 220 mm cable.

Brand: Be Quiet
Model: BK021
MPN: BK021
SKU: BK021
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65.47 GBP 69.98 GBP
23-03-2026 14:24:27
66.66 GBP 69.98 GBP
04-09-2025 07:33:12
69.98 GBP 69.98 GBP
17-09-2025 10:11:40
Airflow 45.21 CFM
Base material Copper
Bearing Type Fluid Dynamic Bearing (FDB)
Cable length 220 mm
Case colour Black
Connector 4 pin
Cooler Form Factor Single Tower
Cooler height 159.4 mm
Cooler Materials Aluminium / Copper
Cooling capacity 200 W
Current 0.11 A
Depth 136 mm
Display model in showroom No
Fan Bearing Fluid Dynamic Bearing
Fan Controller PWM
Fan Depth 135 mm
Fan Dimensions 135 x 135 x 22 mm
Fan Edition Silent Wings PWM
Fan height 22 mm
Fan Speed 1400 RPM
Fins material Aluminium
Form factor CPU Cooler
Heat pipes diameter 6 mm
In stock Y
Included Fan Configuration 1 x 135mm
Included TIM Thermal Interface Material Included
Installation Screws
LED fan No LED
Material Shock-absorbing pads on all four corners
Max. Sound Level 10.5 - 21.4 dBA
Maximum RAM GB
Memory speed MHz
Noise level (low speed) 10.5 dB
Noise level high speed 21.4 dB
Number of fans 1 fan(s)
Number of PCI Express Slots slot(s)
Number of SATA Ports port(s)
Pulse-width modulation (PWM) support Yes
Pump Connectors 1 x 4-pin
PWM Fan Yes
Radiator size 240 mm
Rated voltage 12 V
Refresh rate 60Hz 2Ms Response Time
Rotation Speed 1400 RPM (@ 100% PWM)
Sustainability certificates RoHS
Warranty 3 Years
Weight 920 g
Width 96.3 mm
WiFi Speed Mbps