I've bought used 3090 last year for ML and while it works fine, has correct DRAM and stuff, when I tried gaming on it I've noticed that it is significantly slower than my 3080. I'm not sure if the seller has pulled some shenanigans on me or the card actually degraded during whatever mining they did.
Just beware, the card might be "working fine" on a first glance, but actually be damaged.
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