Be Quiet! BK021 Dark Rock 4 Heatsink & Fan, Intel & AMD Sockets, Silent Wings Fan, Fluid Dynamic
A single‑tower CPU cooler featuring a 135 mm Silent Wings fan, six copper heatpipes, aluminium fins with ceramic coating, delivering up to 200 W TDP while remaining quiet at 10.5–21.4 dB; PWM‑controlled and cable‑length 220 mm.
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Awd-it.co.uk 
LaptopHub 
Quzo | Brand | Be Quiet |
| EAN | 4260052186251 |
| ASIN | B07BYP9S95 |
| Model | BK021 |
| MPN | BK021 |
| SKU | BK021 |
| 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 |
