Currently running 5 7950s, 1 7870 xt(measly 160 khash with yac but does 425 on less then 100 watts for ltc) and 1 7970. Ordering 4 more cards tomorrow but I'm on fence as to which I should go with. The 7970 I have is fairly cheap right now but I havent been able to get much over 600 kh and it's fairly unstable compared to my 7950s that can do 650 with mild oc and 725 with heavy oc. Gonna overnight whatever I decide so hopefully will have 2 or 3 more on yac before it dies off completely.

 I was wondering if a 6gb card would enable future yacing? if that was the case I think it would be worth it to those who were capable of continuing to mine yac considering the diff will drop greatly when gpu's exit the scene.