Methodology
An AMD Ryzen 9 3950X has to be cooled in various levels of power consumption, joined by 16GB Crucial Ballistix Sport (2x8GB) DDR4 memory on an MSI B550 Tomahawk (BIOS 7C91vAB). The Asus ROG Strix GTX 1060 6GB runs in zero-fan mode for the CPU stress tests only and a Fractal Design Ion Gold 750W serves as the power source. The whole thing is housed in the Thermaltake Core P3 as an open benchtable.
The test system runs on Windows 10 Pro 22H2 (build 19045.2251). All data sets are recorded with HWInfo64 v7.34-4930 – 5000ms logging, the specified temperature results from the sensor CPU Die (Average). Since I don’t have air conditioning, the values in the graphs are the delta between room temperature and CPU temperature. This allows all cooling to be compared fairly, even if the ambient temperature is different. The thermal paste included with the cooler or pre-applied is used in each case.
I determine the sound level with a Voltcraft SL-200 meter at a distance of 40cm, which operates in 125ms cycles in Lo mode. The room was measured at 33.2 dB(A), an external sample table helps to break it down.
Benchmarks
In the first test run, a loudness of 40 dB(A) was set at 40cm from the center of the pump and fan on the radiator, in my setup that’s 80% PWM on the fan.
And after that, this cooler still gets to show what it can achieve in terms of cooling performance at maximum speed, regardless of the volume. A maximum of 44.5 dB(A) was achieved at 100% PWM and 40cm distance.
Due to the specific niche that this cooler serves, I will not include it in the big review. It couldn’t even manage the 150 watt run-through without thermal throttle. But what be quiet! i think it’s quite obvious which model is targeted here: the Noctua NH-L9. Therefore, I used this one for direct comparison:
| Cooler | 75W – 40 dB(A) | 100W – 40 dB(A) | 75W – 100% | 100W – 100% |
| bq! Pure Rock LP | 44,73°C | 59,06°C | 42.97°C – 44.5 dB(A) | 55.81°C – 44.5 dB(A) |
| Noctua NH-L9i AM4 Kit | 44,72°C | 58,35°C | 42.53°C – 44.0 dB(A) | 54.66°C – 44.0 dB(A) |
However, it should be mentioned that I used the L9i here and not L9a, i.e. the Intel version with an adapter kit. The L9a for the AMD sockets is minimally larger and should provide a bit more cooling performance.
Summary and conclusion
I have already touched on the really simple installation and mention it again here, so without an extra backplate, you already have many compatibility advantages in the ITX area. Coupled with the very sleek design and attractive price, be quiet! sent a good candidate into the race here.
But that alone is not enough, of course, because the cooling performance is the decisive factor in the end. And compared to the “long-established” Noctua NH-L9, it is quite respectable. Although the Pure Rock LP cannot win in terms of temperature or volume, the difference is really minimal, both measured and subjectively. In my opinion, there is still a possible advantage over the Noctua NH-L9: The be quiet! There is only one version for all sockets, not one variant for AMD, one for Intel, etc. However, as already mentioned, Noctua has to be credited for optimizing the size of the heatsink for specific sockets and also offering adapter kits. But if you have the 8mm more height available in your system and want to save some money, you get a very good alternative here.
The test sample was provided by be quiet! provided without obligation. There was and is no influence on the tests and results. There was also no compensation for expenses and no obligation to publish.
be quiet! Pure Rock LP (BK034)
 | Lieferbar ab 13.05.2024, Lieferzeit (sobald verfügbar): 1-2 Werktage | 44,99 €*Stand: 05.05.24 13:13 |
 | Lieferzeit 9 bis 11 Tage | 44,99 €*Stand: 05.05.24 09:07 |
 | Lieferbar ab 13.05.2024, Lieferzeit (sobald verfügbar): 1-2 Werktage | 44,99 €*Stand: 05.05.24 12:52 |
Noctua NH-L9a-AM4 chromax.black
 | Zentrallager: verfügbar, Lieferung 3-5 WerktageFiliale Wilhelmshaven: nicht lagerndStand: 05.05.24 15:33 | 59,89 €*Stand: 05.05.24 15:34 |
 | Auf Lager - 1-3 Werktage Lieferzeit | 59,90 €*Stand: 05.05.24 14:30 |
 | Lagernd | 59,90 €*Stand: 05.05.24 15:34 |
Noctua NH-L9i-17xx chromax.black
| Zentrallager: verfügbar, Lieferung 3-5 WerktageFiliale Wilhelmshaven: nicht lagerndStand: 05.05.24 15:33 | 59,89 €*Stand: 05.05.24 15:34 |
| Bestellware - 8-10 Tage Lieferzeit | 59,90 €*Stand: 05.05.24 14:30 |
| Lagernd | 59,90 €*Stand: 05.05.24 15:34 |
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