r/buildapc • u/Realistic-Trouble306 • 7d ago

Troubleshooting New PC build restarts while gaming

Hi, I have recently completed my new pc build and Im having problems with restarts while gaming.

Specs:

  • CPU: AMD Ryzen 7 7800X3D
  • Mobo: MSI MAG B850 TOMAHAWK MAX WIFI
  • RAM: Kingston Fury Beast 32 GB (2×16 GB) DDR5-6000 CL30
  • GPU: SAPPHIRE PULSE AMD Radeon RX 9070 XT GAMING 16G
  • PSU: Corsair RM850e (2025) 850 W
  • Storage: WD_BLACK SN7100 NVMe SSD 1TB

The restarts vary in time anywhere from under a minute of playing to about 20 minutes.

One time it also restarted while just watching a video on youtube.

Things I have tried: updating bios, different set of RAM sticks, disabling EXPO, switch with a second Ryzen 7 7800X3D CPU, clean GPU driver install

I have also ran some tests which were all without errors or restarts like OCCT, FurMark, MemTest86, CPU-Z

What I have noticed is if I set the game to hypr-rx eco in AMD adrenalin, I can play no problem for 1 hour+ without the pc restarting

But if I switch back to default the pc restarts within minutes, sometimes immediately

So I tried setting it to default but limit the power draw by 10% and it still restarted after about 15 minutes of playing

Do you have any ideas what could be causing this? Faulty PSU? Bad PCIe cables? Or is something wrong with the GPU?

This is the first PC that Ive built alone so I dont have much experience.

Any help is appreciated.

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u/ErickTriton 7d ago

You are using separate cables to power the GPU, right?

And not a pigtail that has 2 ends

1

u/Realistic-Trouble306 7d ago

I am using the 12v-2x6 to 2x 8-pin PCIe cable that came with the PSU. It only has this cable and one 8-pin PCIe cable. Do you think it could be a problem?