Question Is this Ryzen 9 5900X faulty

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I am testing a Ryzen 9 5900X, but what ever load I put on it, it keeps throtteling.
When posting a thread of troubleshooting nature, it's customary to include your full system's specs. Please list the specs to your build like so:
CPU:
CPU cooler:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
Monitor:
include the age of the PSU apart from it's make and model. BIOS version for your motherboard at this moment of time.
 
The rest of the PC works with other CPU. Owner of CPU complains that he has performance drops at certain loads. It looks better in 3D mark CPU test, but still makes the odd drop to around 600MHz
Ryzen 9 5900X
Cooler Arctic Freezer 36
Asrock A520M-HDV
G skill Rip Jaw 2x8GB
Samsaung 850 256GB
GPU MSI 2080 RTX
PSU Cougar Platinum 1200 3 years, but only 2 month of usage
Wiindows 10 Home
 
Without looking into this much further, an A520 is NOT an appropriate motherboard for this CPU. The VRM/power delivery are not suitable. Additionally, that cooler isn't up to the task either.

It would be best to consider not only a better cooler, probably AIO, but also to get a better motherboard. At the very least get as much airflow over that mobo as you can. Even at that it probably isn't going to be enough. An R7 is too much for that board alone.
 
At the very least get yourself a beefy CPU air cooler and a case with suitable airflow. I do not think the 5900x absolutely needs to be put under water, but it will not work well with a weak cooler in a hot box case.

Also, do not even think of enabling XMP / EXPO / DOCP overclocking profiles in the BIOS. Your mobo's VRMs are already working at the limit with that CPU at stock.
 
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The rest of the PC works with other CPU. Owner of CPU complains that he has performance drops at certain loads. It looks better in 3D mark CPU test, but still makes the odd drop to around 600MHz
Ryzen 9 5900X
Cooler Arctic Freezer 36
Asrock A520M-HDV
G skill Rip Jaw 2x8GB
Samsaung 850 256GB
GPU MSI 2080 RTX
PSU Cougar Platinum 1200 3 years, but only 2 month of usage
Wiindows 10 Home
I had a Ryzen 7 5700G that was weird like that, it worked fine in other titles, but it ran like crap in fortnite specifically. I swapped the ram, motherboard, power supply, SSD, a fresh install of windows, put on a better cooler just in case the temps weren't reporting correctly, enabled PBO, disabled XMP, played with the voltages and settings manually, and fortnite still ran like crap. Finally I swapped it for another 5700G, and the issues with fortnite went away. Sometimes a CPU can test good, and have a weird specific edge case where it just wont work right. I ended up keeping that 5700G and using it in a PC I keep at my inlaws, I cant sell it because it is defective, and I dont play fortnite. The cpu has worked fine for other games since, sometimes tech can be weird.
 
The rest of the PC works with other CPU. Owner of CPU complains that he has performance drops at certain loads. It looks better in 3D mark CPU test, but still makes the odd drop to around 600MHz
Ryzen 9 5900X
Cooler Arctic Freezer 36
Asrock A520M-HDV
G skill Rip Jaw 2x8GB
Samsaung 850 256GB
GPU MSI 2080 RTX
PSU Cougar Platinum 1200 3 years, but only 2 month of usage
Wiindows 10 Home

yeah no the owners on some rather strong medicine if he thinks the arctic freezer 36 can keep it cool i had to set a temp throttle cause my asus board wants to nuke my machine ( never buying asus again)

install a a aio or higher 7 heatpipe or higher cooler personally id go with aio as mine is struggling under air at full load.
 
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The cooler isn’t the issue. The highest temperature measured is 63 C
I will do some measurements of the of the voltage flux, but I don’t think that is the issue either. The CPU isn’t overclocked and the spikes are extreme
 
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