Question New build with old gpu crashing at benchmarks. Please help!

Apr 20, 2021
Hi I recently built a new pc and am stuck, pc seems to run fine during furmark and prime 95 stress testing. But hard crashes giving my moitor no signal while benchmarking Heaven, Warhammer 2 rdr2 and 3d mark.
New pc specs are :
Ryzen 5600x
Asus B550m plus motherboard
Antec hcg750w gold
Corsair vengeance ddr4 3200 cl16 ram 8gb x2
GPU Asus strix 970

Things i've tried so far:
  • Uninstalled drivers with DDU and then reinstalled them/installed older driver.
  • I went over a few discord servers where people speculated psu and told me to run HWinfo and log while doing prime95 + Furmark. It seems stable without crashes and psu seems ok there.
  • So everyone pointed the gpu, so I tried adding the gpu back into my old build where all the tests ran smoothly.
  • Thinking it might be the motherboard I also tried using an old GTX 560 laying around, but that seems to run fine in the new system.
I have no idea what else it could be, any help would be highly appreciated.