Who would buy 3 1080ti for 1500$? Friends warning me that I will never get my ROI back even if I got them for free the other said 1000$ max, maybe u should just let the seller walk away in peace? I have 24hrs to decide
If you can't answer this question yourself, then you don't need these graphics cards. You need to look at the mining logs for the last weeks, video card settings, temperatures and external state. For a beginner, I think it's a bad choice, better look for a 2060 super or 2070.