Question PC Crashing and black screen monitors

Dec 13, 2023
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After running various system tests and doing a total of 15 or more hours of researching the issue I am 99% certain it's my PSU.
My main list of reasons,
1: when my pc freezes the fans begin spinning uncontrollably due to faulty power modulation
2: There are no event logs when I have a system crash -major sign of a psu failure
3: I've gone through every driver reset and update, rolled back and restored my windows image to the most recent one, with a clean installation, performed successful CPU stress tests and DRAM tests, including replacement of the DRAM sticks, leading to the GPU and power supply.

No overheating issues according to my monitoring, max GPU temps at 84C, max cpu temps at 50C and max motherboard temps are at 45C so it's unlikely to be thermal issues. the gpu is showing no graphical fidelity issues as well as every game will run nearly perfectly, with some underperformance due to what feels like DING ding ding under-powering. My overall knowledge, capability and reasoning has lead me to the educated hypothesis that my PSU never worked properly to begin with, as it was always under too high of a load, 95% to be exact, 15% above maximum recommended power load on a supply unit, and has done this since I built it. Now I'm a bit tired of this issue as it becomes repetitive upon certain intervals of time, some days it will crash several times, then I'll go a month or so without any issues. This only happens during nvidia benchmarks and intensive next gen games. Though, I am not a tech, and I cannot 100% guarantee this is the issue without additional support or buying a new psu. Online calculators with my included peripherals say I'm at 95% load when 80 is recommended. Turned off any OC tuning that I had running as well.. Recommendations?

Specs:
3080 Ti FTW3 OC edition 405W draw at max with OC - powered with 2 8-Pin PCIe connectors and one 6+2-Pin PCIe connector
Ryzen 9 5900x
Samsung 980 1 TB
Samsung 980 Pro 2 TB
Trident Z Neo cl 16 3600 ddr4 16x2 - D.O.C.P. On
PSU - Corsair 850RM 2021 Ed. - Fully Modular - Supposedly using 95% at full load probably since half of its use is dedicated to the gpu alone
ASUS Tuff X570 motherboard/Plus Wi-Fi bios ver 4005



I already checked the only minidump file my pc has produced out of the numerous crashes, it was showing driver errors so I used the DDU tool and reset and rollback to the most recent stable version before these crashes really began being a persistant issue. This hasn't been as bad before as it is now, and it continously is crashing under load for about ten minutes. Today, thinking the problem may be fixed, I attempted to play the same games that have been providing issues for only a couple days now and again after about ten minutes in, the whole system crashes out and blackscreens with sound still running for a bit. My fans reset and my ram modules turn white, however I've run full scans on the modules too. I see, I've pretty much always had this error. Even with safemode DDU uninstallations and driver rollbacks. I've downloaded the driver from Dec 4 and it still done crashed...
 
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Welcome to the forums, newcomer!

with a clean installation
Speaking of OS, where did you source the installer for said OS? Was the installer recreated to rule out a faulty installer? Was the OS installed in offline mode?

corsair 850x
How old is the PSU in your build?

You forgot to mention the make and model of the PSU. BIOS version for your motherboard?
 
Highly unlikely you are running that high under a typical gaming load. PSU Calculators are worst case, everything in the system consuming maximum power.

405W from a 2016 Corsair RM850x might be a little concerning. As that would say that any power spikes could be quite a bit higher than that. I have the same GPU and likely the same power supply, but I also didn't bother overclocking the GPU, so the max power is still 350W.

Did you use the stock cables? Ideally you should be using 3 of the PCIe outputs from the PSU. You want to use cables that have two 6+2 PCIe connectors on the end, but only use one of the connectors. That way you spread the load as much as possible. I purchased cable mod sets that do direct connections from the PSU to each GPU 8-pin.
 
Welcome to the forums, newcomer!

with a clean installation
Speaking of OS, where did you source the installer for said OS? Was the installer recreated to rule out a faulty installer? Was the OS installed in offline mode?

corsair 850x
How old is the PSU in your build?

You forgot to mention the make and model of the PSU. BIOS version for your motherboard?
Thank you for the welcome!
-The OS was installed on a clean drive through Microsoft that I bought and allocated specifically as a windows media drive. I always source my media images from the Windows site specifically. Also, apologize it seems I made an error, also I've been pulling apart my pc for the past hour trying to see if any wiring or loose parts were the culprit. Another important detail, I just readjusted the GPU cables into slightly different slots, and reorganized them and now am experiencing no crashes today. The PSU is actually the corsair 850RM series from a year or so ago, pc is just around 2 years old now. fully modular 80 gold rating, i believe the 2021 ed. Bios ver 4005 on ASUS Tuff Plus wifi
 
Highly unlikely you are running that high under a typical gaming load. PSU Calculators are worst case, everything in the system consuming maximum power.

405W from a 2016 Corsair RM850x might be a little concerning. As that would say that any power spikes could be quite a bit higher than that. I have the same GPU and likely the same power supply, but I also didn't bother overclocking the GPU, so the max power is still 350W.

Did you use the stock cables? Ideally you should be using 3 of the PCIe outputs from the PSU. You want to use cables that have two 6+2 PCIe connectors on the end, but only use one of the connectors. That way you spread the load as much as possible. I purchased cable mod sets that do direct connections from the PSU to each GPU 8-pin.
I bought a C type 4 cable kit for the PSU a while ago, and I indeed utilize 2 8 pin PCIe connectors and one stock 6+2 connector from the psu. However even without any OC tuning on my card pulls a whopping 398W at peak gaming, and pushes out some crazy numbers on tests for the card. OC tuning I'll pull out 407W on rare occasions
 
B450, B550, X570. Which??

Remove this and test again.
Wow I'm a total dunce, my apologies. It's been a while since I built it so a lot of the info slipped my mind. It's an X570 And I'll try reinstalling NZXT Cam. Though it would be wierd that changing the slotting of my GPU power cables caused it to temporarily stop crashing, now 12+ hours in of performance testing, noticed that my GPU is only pulling out 380W now instead of it's previous 400. However without NZXT Cam my CPU cooler and my keyboard will no longer work properly, causing CPU crashing instead.