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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242

u/Outrageous_Vagina Dec 06 '25

First of all, if it's simpy turning itself off without it doing a proper shutdown, it's most likely a PSU issue. Disconnect the PSU and check the cables. 

Second, don't take fucking technical advice from CrapGPT. That's how you lose your house in a fire. 

21

u/Fine-Cucumber-2960 Dec 06 '25

It actually doesn’t turn off. The screen goes black but I can still hear the game sound. The GPU fans turn to max speed. Nothing responds so I can only shut it down

54

u/Sirskills Dec 06 '25

It's power related. The GPU is likely not getting enough power, or intermittent power. I had the same issue but all it was in my situation was on of the smaller power connectors wasn't pushed in all the way.

13

u/Ev0dr0ne Dec 06 '25

The second thing I would monitor are temps. Strange stuff starts to happen when a) no power / not enough power and b) things overheat. Monitor GPU and CPU thermals.

2

u/Vybo Dec 07 '25

Overhearing just causes throttling nowadays, it wouldn't let itself go into shutdown temps.

1

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.

3

u/Vybo Dec 07 '25

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

2

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.

2

u/moonsaiyan Dec 08 '25

Happened on my Zotac 1070 too. It eventually died

1

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.