






🧊 Stay cool, stay quiet — the ultimate low-profile CPU cooler for the sleekest builds.
The be quiet! Pure Rock Low Profile CPU cooler combines a minimal 45mm height with robust 100W TDP cooling, making it ideal for compact Mini-ITX systems. Featuring three copper heat pipes and a whisper-quiet 92mm fan capped at 30.6dB(A), it supports a wide range of Intel and AMD sockets. Designed for silent, efficient cooling in tight spaces, it’s the go-to solution for professionals demanding performance without compromise.


















| ASIN | B0BNYVJNL9 |
| Air Flow Capacity | 33 Cubic Feet Per Minute |
| Best Sellers Rank | #9 in Computer CPU Cooling Fans |
| Brand | be quiet! |
| Compatible Devices | Intel sockets: 1700/1200/1151/1150/1155 | AMD sockets: AM5/AM4 |
| Cooling Method | Water |
| Date First Available | January 20, 2023 |
| Global Trade Identification Number | 04260052189757 |
| Item Weight | 12.7 ounces |
| Item model number | BK034 |
| Manufacturer | be quiet! |
| Material | Copper Plastic |
| Maximum Rotational Speed | 2500 RPM |
| Noise Level | 30.6 Decibels |
| Number of Items | 1 |
| Power Connector Type | 4-Pin |
| Product Dimensions | 5.12"L x 5.12"W x 1.77"H |
| Voltage | 12 Volts |
| Wattage | 4.2 watts |
J**F
Glad I found this one to use. It is quiet and lightweight.
Bought two of these. Was surprised that it fit in a micro Coolermaster N200 case. Have a bit of room to close the lid. It is a little tricky to get the hooks on but surprised that it keeps a Ryzen 9600 cpu very cool. I love the copper piping. Isn't very heavy either. Worked great on the two computers I built recently.
M**R
Solved a difficult ITX-mini desktop heat problem.
I have an ITX-Mini industrial type all-in one ultra-slim open air mesh frame chassis & motherboard with an i7-4790S cpu, that has been a beast to tame workload heat, in this smallest of form-factor chassis, in an open to the elements temperature environment, and much to much dismay, and satisfaction, the Be Quite! Pure Rock LP finally solved my CPU heat throttling problems. The original OEM installed CPU cooler was essentially the basic original Intel aluminum lug & fin, topped with a fan, reference CPU cooler, but cut down to very low 37+mm profile to fit in an ultra-slim desktop chassis. Searching for better replacements I found the Noctua NH-L9i cooler was a few mm's tool tall to fit in the chassis, and that it had height tolerances problems in the CPU clearance zone underneath the CPU cooler. An ARCTIC Alpine 12 LP did fit the clearance issues, and had lower noise, and power use; however still being based on an aluminum lug & fin design, (no heat pipes), still was not able to keep up with sustained temperatures, under even moderate loads. When Be Quite announced their new LP cooler and that it was a copper heat pipe design, fit into the most minimal/maximal dimensions limits allowed for CPU cooler tolerance zones, and could tame even newer generation CPU's, I was skeptical. But as a still last ditch resort to keep a workhorse computer thermally tamed, I decided to purchase one, give a try, with the clearance issues, see if I could even get it installed, and if it could improve on the Alpine LP. Mission successful !!! The install was razor shave close cut; not even micro-micrometers to spare in clearance tolerance all the way around, after mounting; from the top of the fan just barely touching the chassis cover, and with the CPU cold plate fit and around & underneath the cooler; including the cooler and mounting bracket just barely fit over a row of power capacitors sitting just below the bracket. The mounting certainly is "flexible" but this turned out to be a benefit, after getting the mounting brackets and screws tightened into place. The bracket installation wrench provided & needed to tighten the CPU mounting bolts, (not the mounting screws), had some difficulty getting around tight part clearances, that were right up and into the CPU cooler clearance zone, but I was able to work the wrench enough to secure the mounting bolts to the brackets; then tighten the mounting screws. After turning the system back on, immediately I noticed a 10-20 deg F. reduction, as compared to typical temps with the Alpine LP. And even with now spring summer temperatures coming on, and the ability to cool the cpu is being impacted by increase in ambient air temps, the Be Quit! LP has continued to maintain the heat dissipation, through all load testing; most notably that CPU is staying below throttle temperatures where; the OEM installed could never do, and Alpine LP could barely keep up with! Additionally noticed is that the noise level was way down, even at full RPM the Be Quit! Any fan noise had a slight low hum winy noise, but only noticeable at maximum RPM. Overall, this CPU cooler solved a long and ongoing cooling problem in a very minimalist chassis install, and it does it with no no high speed fans, or related added noise.
M**A
Great cooler
Easy to install, looks good, runs quiet and keeps the chip cooled
P**S
Quiet and cool
Easy install, quiet fan, and lights
L**.
Great heatsink. Terrible paste
Fan does as advertised, which is really nice. But if you use this with an AM4 chip and ever need to take it out of your case, get ready to do the cemented chip dance with the paste--I wish I had scraped it off and applied my own. If you do use the pre-applied paste, you definitely 100% do not want to remove this heatsink while the chip is cool. Maybe mine was overly dry in the box or something, but yikes.
J**.
A solid 5 star CPU cooler
I put this on an 5900XT (16 cores, 32 threads). It runs cool, it's quiet, well made, and it looks nice. Temps have never gotten close to throttling levels so far. It's far more reasonably priced than water coolers. Mounting wasn't difficult, but you need to change the motherboard fan mounts. Examine the instructions carefully as the mounting brackets are not interchangable, and need to be in a specific orientation. Be aware the heat pipes extend out over the RAM, and there may be clearance issues with some RAM modules. It's also pretty large, and it may not fit in smaller cases.
R**Y
This CPU cooler is FLAWLESS
I gotta say, this is my first time upgrading my PC and it's prebuilt. I noticed a whole difference with this cooler compared to the stock version (coolmaster). I did a stress test on it and I was impressed with the results. Temperatures were normal. Instructions were clear. While you can hear it kinda, which is normal if you're running games, but this CPU cooler is 10x less louder than my coolmaster (which sounded like a jet engine). I will be replacing the rest of the other fans with Be Quiet! products! I may be satisfied with the product, but I will update within 2 months :) AMD Ryzen 5 7600 Be Quiet! Pure Rock 3 LX Multicore Test: 68.4C (MAX) Singlecore Test: 45.6C (MAX)
S**E
Perfectly easy to set up. Bit huge and wouldn't fit with my RAM. but it's detachable and "move around-able" fans fixed that in a hurry. 4 Stars easily.
S**N
Cooling my Ryzen 5700X with this and it does a great job. Rarely over 70C when I play games, and also very quiet. A fitting upgrade to the Wraith Prism I used before, which was both loud and had my CPU creeping up towards 80C in some cases.
J**T
Perfect
J**B
The be quiet! Pure Rock 3 LX CPU Air Cooler is solid and quiet. I am using it for a Ryzen with 65W TDP and it keeps it nice and cool. Great value.
M**A
You want quiet? Buy it. It doesn't get quieter than what you get here. Very recommended.
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