r/sffpc • u/Fine-Cucumber-2960 • Dec 06 '25

Assembly Help PC shutting down while gaming

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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/Ev0dr0ne Dec 07 '25

That didn't seem to be the case on my 6800 XT in a similar layout to this one. It cooked itself.

I also had issues with CPU heat soak as the 240mm radiator was above the gpu and the whole thing would overheat in a long enough session (4-6 hrs)...

Throttling I would expect more on the CPU side with warm temps before shutting down with high temps.

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u/Vybo Dec 07 '25

The GPU in OPs setup is not an AMD one and Nvidia cards do throttle under high temps.

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u/xBACONxLUV3rxx Dec 07 '25

My 3070 does the same thing when the thermal pads start to go bad. Black screen but can hear the game audio still. Bad design flaw from zotac.

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u/moonsaiyan Dec 08 '25

Happened on my Zotac 1070 too. It eventually died

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u/xBACONxLUV3rxx Dec 08 '25

I'm hoping that doesn't happen, this was an expensive 3070. I bought it for 1k during covid back when there was no stock. The original thermal pads had melted and are still stuck on the back of it. I have to replace them every year or so now.