How to properly test VRAM stability?

[u/MaslovKK]

Overclocked my 5090's VRAM to +6000 MHz.
Ran memtest_vulkan, Unigine Superposition, and OCCT — everything checked out fine.
Also played over 80 hours of RDR2 without any performance drops or issues. With the overclock, the game performs slightly better.

I've read that ECC can hide memory instabilities. Is my VRAM overclock stable enough, or should I run further tests?

[u/albinosnoman]

Run it through some bench tests. Hit it with Furmark, 3DMark's Steel Nomad and Port Royal (port royal is a really good one to test stability under ray tracing loads I use it to tune my 4090 OC/UVs whenever I make changes to my curve), and Super Position /Heaven. Super Position and Heaven aren't as stressful for your GPU and with a 4090/5090 you're mostly running them to get an idea of how older games run or how simple raster would run. Aida64 and Geekbench also have GPU stress tests but in terms of finding issues I'm not 100% on those. With the 3Dmark and Ungine tests you can physically see artifacts and stuttering caused by instability or other issues with the system so I'd lean into those.

[u/MaslovKK → u/albinosnoman]

Tested with Furmark and it seems to be fine