I promise you he did not weed out the ones that were "poor miners". Save one card that "only" does 650 kh/s, the rest of them are mining at 699 kh/s for me, while being UNDERVOLTED! These cards are in-freakin-credible. Simple as that. I've been trying to get ahold of him to see if he has one more to sell me, even if it doesn't have an arctic accelero cooler on it. Do not even hesitate for a second when it comes to buying from this guy!
So yochdog.... what's it gonna be?! Got another card (just one!) to sell me?
(Doesnt have to be an arctic card!)
EDIT: And you are well low of his actual hashrate,