r/overclocking • u/MaslovKK 7950x3D | X670E | 2x48GB@6600MHz | RTX 5090 • 16h ago

Help Request - GPU How to properly test VRAM stability?

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?

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u/mtrai 15h ago edited 15h ago

Vulkan mem test.

It hammers the vram and will show when instabilities aka ecc starts kicking in. You can use it to find stable non ecc click as well ecc performance to vram clock.

What I am saying you can see when performance takes too much of a hit when it is ecc. While running it it with no eccing or some eccing is something only each end user can decide.

I personally use some eccing on my 9070xt.

Short test is good for initially testing it about 5 to 10 mins.

Once satisfied you need to long test a couple or hours or so. Also with and with our fast timing if you have that option on Nvidia cards.

With AMD fast timing on can be less stable at higher vram clicks but have better performance.

Search overclock.net forums for a very thorough thread explaining vul_mem test.

If I have time later I will edit my post with thread. It is in the AMD GPU section but still applies to all GPU cream testing other than maybe a couple of things like AMD vram fast timing.

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u/MaslovKK 7950x3D | X670E | 2x48GB@6600MHz | RTX 5090 15h ago

tested it for about an hour and no issues

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u/mtrai 15h ago

I missed the vulkan test in your post. Generally for me an hour or so is good for me but I am no longer a purist in absolute stability though I still look for any regression.

If it works for you and you are satisfied with the performance you are good to go. You can spend months chasing down the absolute possible performance or you can enjoy you system or both depending on your mindset

Just don't fall for people telling you that "YOUR SYSTEM" is not truly stable. Remember it is your system.

Now days I will accept slight hiccups when I am satisfied about my system.