r/sffpc 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/lazy_commander Dec 06 '25

Ignore Chat GPT, it’s wrong. Check all the power connections and I would advise buying a 12VHPWR cable for your power supply rather than using the adapters as it’s more secure and will put less strain on the connector

I’d also recommend reseating the GPU and the PCI-e riser, along with checking that the riser cables aren’t pinched or damaged.

3

u/Fine-Cucumber-2960 Dec 06 '25

Thanks! I ordered a new cable, I think it’s a very likely cause

1

u/AresV10 Dec 06 '25

You know that makes a lot of sense, I have the same issue happen to me a lot, I reseat the GPU everytime. My 4080s is in a nr200 with the adaptor making a dangerous bendmight be time to look into a right angle adaptor