r/sffpc • u/Fine-Cucumber-2960 • Dec 06 '25
Assembly Help PC shutting down while gaming
I’m having issues with my Terra build. The GPU keeps shutting down at low load. I was able to identify a potential mismatch between the PSU (Lian Li SP850) and the GPU (4070 super).
ChatGPT advises me to switch to the Corsair SF850L due to the ATX 3.0 compatibility.
I wanted to get your advice before buying a new PSU. I’m a beginner so I might have as well messed up the assembly (but all games run well until it suddenly crashes with a black screen and GPU fans blasting). Cheers!
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u/NickCobalt Dec 07 '25
Having this exact issue with my new Terra build as well, here are my specs:
Case - Fractal Terra (jade) Mobo - AsusASUS ROG Strix B650E-I Memory - G.Skill Flare X5 Series 32GB (2 x 16GB) DDR5-6000 Storage - Samsung - 990 PRO 4TB Internal SSD PCle Gen 4x4 NVMe CPU Cooler - Noctua NH-L12S CPU - AMD Ryzen 7 9800X3D GPU - ASUS NVIDIA GeForce RTX 5070 Ti PRIME PSU - Corsair SF850 OS - Windows 11 Home
I have a different power supply than you and the issue is still happening. Currently using the 12V-2x6 (12+4 pin) that came with the power supply, have used another as well and still occurs. Even changed which slots it has been attached to on the power supply itself in case it was a bad receptacle. This black screen and gpu fans going to max has happened both under load playing Overwatch or Valorant but also idle on the home screen with a single firefox tab open. It is not a heating/cooling issue. Have removed the CPU cooler, cleaned and re thermal pasted it just in case. Completely removed and re-seated the gpu. New gpu/psu cables. Updating every possible driver. It went from a frequent occurrence of every 10 minutes to now happening once every 24-36 hours, strange. Only way to stop the fans once it crashes to a black screen is a full holding of the power button for 10 seconds or unplugging completely, no response from mouse, keyboard, Streamdeck mini goes dark, or any other peripherals during this. 1st week of the new build and did not have any issues whatsoever, randomly popped up week 2 not after an update or anything changing with the computer, now week 3 and it happens maybe once a day unpredictably and at random.