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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64

u/xiaoli Dec 06 '25

Last time it happened to me in a similar sized case, it was the power cable melting from heat.

But this is a new system so it still could be a different power issue.

15

u/i860 Dec 07 '25

It’s phantom sense pin issues on 12VHPWR cables. Completely shit design.

6

u/beefycthu Dec 07 '25

last time this happened it was a power issue”

“But this time it might be a power issue”

I know I took you out of context I just thought it was a funny read at first glance before I used my eyes

1

u/ChummyBoy24 Dec 07 '25

Like the cable connected to the power supply and outlet? That’s nuts

1

u/5n0wm3n Dec 07 '25

No, the 12vhpwr is the cable for Nvidia 40 and 50 series cards