Not sure if I like the idea of a $350 used 3070 from a private seller right now.
before i would probably not even touch.
Now however might be a different story as these mining cards are typically majorly undervolted, and Ram only overclocked.
That means its pretty quick to figure out if the card is artifiacting, and the core being kept undervolted will probably give you more then a reasonable life out of that card.
LHR cards are even better as they are mostly limited to 70% load... until reciently when a full unlock was released.
But still LHR cards.. 3060Ti... 3070Ti... both are mostly all LHR with a few exceptions on the 3060ti.
But non LHR cards will definitely cost more then LHR, so you shouldn't even bother looking for non LHR.
GET THE LHR CARDS IF YOUR A BUDGET GAMER.
Old mining cards are not cards you intend on keeping for 5+yrs... unless we by some magic wave again see a massive influx of miners and you can't get a videocard like some people who are still stuck on a 1080Ti.
But again.... i would probably go after the CREAM of the CROP AIB cards, the ones with big heat sinks like a ASUS TUFF / EVGA FTW3 / ASUS STRIX card.
Definitely wouldn't touch a MSI, nor would i touch Zotac.
Also don't settle of a regular 3060/3070 for gaming... always make sure it says Ti at the end the only exception being the 3080 and 3090.
Those 2 letters at the end can sometimes mean it will last tech wise an extra year possibly a bit more before the non Ti's are really considered obsolete.