be quiet!
be quiet! Pure Rock 3 LX CPU Air Cooler
Bottom line: The be quiet! Pure Rock 3 LX CPU Air Cooler ($24.90 on Amazon as of 2026-10-21 04:20 UTC): 190 W TDP rating covers most mainstream and gaming CPUs; main trade-off: single 120mm fan, so no dual-fan push-pull out of the box.
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*Price sourced from Amazon.com. Last updated 2026-10-21. Price and availability subject to change.
Pros & Cons
Pros
- ✓ 190 W TDP rating covers most mainstream and gaming CPUs
- ✓ 4 black 6mm heat pipes use HDT direct contact with the CPU
- ✓ Slim tower clears RAM and VRM heatsinks, no memory height limit
- ✓ Light Wings LX 120mm PWM fan has funnel-shaped outlets for more fin airflow
- ✓ AM5 offset mounting centers pipes over the CPU hot spot
Cons
- ✗ Single 120mm fan, so no dual-fan push-pull out of the box
- ✗ 190 W ceiling leaves little margin for overclocked flagship CPUs
- ✗ ARGB needs a motherboard header, adding a cable to route
- ✗ Black-only finish, no white or silver variant listed
Manufacturer description
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 using a rating × review-volume × price-fit model applied to published specs and reviews 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. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.
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 retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.
Frequently Asked Questions
Will the Pure Rock 3 LX fit my CPU socket?
It supports AMD AM4 and AM5 plus Intel LGA 1700, 1200, 1151, and 1150. AM5 users also get an offset mounting option that centers the heat pipes over the CPU hot spot.
Is it powerful enough for a gaming CPU?
It is rated for 190 W TDP, which be quiet! targets at gaming, multimedia, and graphics systems as well as mainstream and entry-level builds. Check your CPU's rated power draw against that 190 W figure.
Will it block my RAM slots?
No. The slim design was specifically built to increase RAM and VRM cooler compatibility, and be quiet! states it enables limitless memory height with full configuration of all RAM banks.
Does the ARGB lighting sync with my motherboard?
The Light Wings LX 120mm PWM fan has 16 LEDs inside the impeller hub shining out onto frosted blades. Confirm header compatibility with your board before buying, as sync support varies by motherboard.
How hard is the installation?
be quiet! ships it with a preinstalled mounting bridge plus screws, so attachment is a single-step process. See the included manual for socket-specific steps and current warranty terms.
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 |
| Full listing title | 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 |
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 listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-10-21. Price and availability subject to change.
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