In order to test the CPU cooler we used the following configuration:

• CPU: AMD Ryzen 5 5600X
• Thermal compound: stock from be quiet!
• Case: bequiet! Silent Base 802
• Case fans: 2x140 bequiet! Silent Wings 3 High-Speed RPM speed controllable via SmartFan BIOS + Asus Xpert4 software
• CPU Fan: Stock fan
• Motherboard: Asus X570 E-Gaming with 4408 BIOS
• Memory: 2x16GB G.skill Trident Z RGB CL14 @ 3200MHz CL14 (XMP Profile) @ 1.35V
• PSU: be quiet! Straight Power 11 650Watt
• HDD: Crucial MX500 SSD
• VGA: Asus 1060 6GB Dual
• Ambient room temperature ~ 25 Celsius (with AC climate control) - Environment Temperature measurements: Precision Gold N09AQ Envirometer Meter
• Sound measurements at 1m distance: miniDSP UMIK-1 microphone with calibration file and latest REW software
• Operating system: Windows 10 x64 with all the latest updates installed
• Software: AIDA64 / HWInfo / OCCT Enterprise Edition (Latest builds)

Before each run, we left the system idle for some time and reset the OCCT Enterprise Edition values to start recording. We set the CPU fan speeds at "Smart Mode" with the Asus Xpert4 software. The case fans were also set at SmartFan mode with the option for Auto Fan Stop at low loads down to 0% for the two front fans and auto for the back case fan.

The CPU fan was detected from the Asus motherboard and gave us the following rotating fan curve

Bios settings:

• Ai Overclock Tuner: D.O.C.P -> XMP DDR-3200 CL14
• BCLK Frequency: 100MHz
• FCLK Frequency: 1600MHz
• CPU core ratio: Auto
• TPU: Keep Current Setting
• Performance Bias: Auto
• VDDCR CPU Voltage: 1.100V
• VDDCD SOC Voltage: 0.900V
• DRAM Voltage: 1.350V (XMP)
• Precision Boost Overdrive: Auto
• Rest BIOS options: Auto

We use OCCT Enterprise Edition with a 30min run with the following settings:

• Data Set: Small
• Mode: Extreme
• Load Type: Steady

So we ran a 65W TDP processor (AMD 5600X) under heavy load with default PBO OC, can the be quiet! Pure Rock LP perform well? The answer is yes. The Pure Rock LP has a maximum of 75 Celsius and kept the temperature under 70 Celsius, which should be considered very good, keeping in mind its overall size and volume. If we compare it with the AMD Stock fan, which has similar dimensions, there is an almost 10 Celsius difference.

Placing the miniDSP UMIK-1 microphone around 1m from the closed case, we measured the idle noise level (that includes the case fans) however when a full load is being produced, noise levels will be higher, due to the small volume of the CPU cooler, case fans have more work to do trying to reduce CPU temperatures. While not the best performance (at least compared with huge CPU coolers), we are satisfied with the overall noise levels (keeping in mind its volume and size).