Trying to OC my 7800XT but it’s causing artifacts.

So I've been trying to and Undervolt my 7800xt by following techpowerup's guide. set a minimum clock speed of 2800mhz, set a max of 5000, and did an undervolt to 1050mv.

I also OCed the VRAM to 2538mhz. did multiple stress tests from 0CCT and 3dMark and it passed it. Trying to boot up God of War or Elder Ring results from this though and I have to force restart it.

I figured it might've been the memory so reverted but it stayed so now I'm wondering if it's the Undervolt? Also just want some confirmation that this sort of artifacting does come from unstable OC/UV, right? Because I've seen similar artifacts from a dying GPU. But yeah to sum it up, any advice for how to make it stable? And is this type of artifacting/instability normal or is my 7800XT dying?

Thanks in advance. I'm still learning!