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How meaningful is VRAM underclocking on Ampere GPUs?

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Long story short, RTX 3090 has a few too many VRAM modules and thus, this doesn't leave too much energy budget for its GPU. In my theory, lowering the VRAM frequency should mitigate this issue and until some point, allow more potential than hurt performance.

But this is just my theory. I don't own any NV GPU whatsoever. My 6700 XT, being tweaked, gets its VRAM cooler and less power hungry but my GPU OC did hit the voltage wall rather than the wattage one. Does the same apply to NV? Anyone to test this out?

Unnecessary to test it on a 3090, any Ampere GPU is fine.
 
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