be quiet!
be quiet! Pure Rock 3 LX CPU Air Cooler | 4 High Performance 6mm Heat Pipes with HDT Technology | 120mm Quiet ARGB PWM Fan | AMD:AM4 AM5/Intel LGA 1700/1150/1151/1200 | Black | BK040
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*Price sourced from Amazon.com. Last updated 2026-05-08. Price and availability subject to change.
Bottom line: The be quiet! Pure Rock 3 LX CPU Air Cooler | 4 High Performance 6mm Heat Pipes with HDT Technology | 120mm Quiet ARGB PWM Fan | AMD:AM4 AM5/Intel LGA 1700/1150/1151/1200 | Black | BK040 is a niche pick — read recent reviews before buying in the processors category, priced around $27.90. Compare close alternatives before committing.
The be quiet! Pure Rock 3 LX is a compact 120mm air cooler built for gaming, multimedia, and mainstream builds that need real thermal headroom without a radiator. Its 190 W TDP rating covers the vast majority of consumer CPUs, and four black 6mm heat pipes with HDT technology sit directly against the CPU surface to pull heat straight into the fin stack. be quiet! kept the bends minimal and the bending radius high so each pipe holds its performance. The bundled Light Wings LX 120mm PWM fan uses funnel-shaped air outlets to push more airflow across the fins, and 16 LEDs inside the impeller hub…
SpecPicks Verdict
SpecPicks scored be quiet! Pure Rock 3 LX CPU Air Cooler | 4 High Performance 6mm… using a rating × review-volume × price-fit model applied to our editorial and benchmark analysis across the processors category. be quiet!'s processors lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Mixed or limited buyer feedback at this price point — focus your evaluation on recent reviews that specifically address build quality and long-term reliability, and shortlist one or two close alternatives before deciding.
Common buyer scenarios for processors of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.
Pros & Cons
Pros
- ✓ Backed by be quiet!'s warranty and support channels
- ✓ Ships via Amazon with Prime eligibility and the standard returns policy
Cons
- ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
- ✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified
Key Features
- Pure Rock 3 LX is aimed at consumer PCs. With 190 W TDP it offers an excellent cooling capacity for gaming, multimedia and graphics systems, as well as mainstream or entry level computers of all types. The performance is further increased by funnel-shaped air outlets on the Light Wings LX 120mm PWM fans, which increases airflow over the fins. In addition, the fan blades are optimized for maximum airflow, making this fan the ideal match for Pure Rock 3 LX.
- 16 LEDs are located inside the hub of the impeller of the Light Wings LX 120mm PWM and shine outwards onto the frosted fan blades. This creates an unmistakable look and enables you to express your creativity.
- Pure Rock 3 LX is equipped with 4 black 6mm heat pipes, matching the color of the heat sink. The heat pipes are key to the cooler’s great cooling performance, because they transport the heat to optimum locations on the cooling fins. They do so with minimal bends and high bending radius, to maintain the performance of each heat pipe as good as possible.
- The Pure Rock 3 LX’ slim design increases RAM and VRM cooler compatibility significantly and enables limitless memory height. Thanks to its compact construction Pure Rock 3 LX is the perfect choice for PC cases that have limited space. Notwithstanding, it allows full configuration of RAM banks.
- Installation is easier than ever with the Pure Rock 3 LX. Thanks to its convenient, preinstalled mounting bridge plus screws and a firm yet gentle fixing method, cooler attachment is a breeze. Users of an AM5 CPU by AMD can benefit from an offset mounting to center the heat pipes above the hot spots of their CPU.
Full Specifications
| Brand | be quiet! |
|---|---|
| Model | BK040 |
| Voltage | 12 volts |
| Wattage | 190 watts |
| Set Name | LX |
| Unit Count | 1 Count |
| Noise Level | 31.2 db |
| Part Number | BK0 |
| Compatibility | PC |
| Cooling Method | Air |
| Number of Items | 1 |
| Compatible Devices | Intel sockets: 1851/1700/1200/1151/1150/1155 | AMD sockets: AM5/AM4 |
| Power Connector Type | 4-Pin |
| Maximum Rotational Speed | 2000 rpm |
| Item Dimensions L x W x H | 2.79"L x 4.88"W x 4.72"H |
| Global Trade Identification Number | 04260052192498 |
Ready to buy?
be quiet! Pure Rock 3 LX CPU Air Cooler | 4 High Performance 6mm Heat Pipes with HDT Technology | 120mm Quiet ARGB PWM Fan | AMD:AM4 AM5/Intel LGA 1700/1150/1151/1200 | Black | BK040 is available on Amazon with Prime shipping and the full Amazon returns policy. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
View Current Price on Amazon →
*Price sourced from Amazon.com. Last updated 2026-05-08. Price and availability subject to change.
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