Hi, can anyone tell me which card is currently the best for mining in terms of h/w. Currently I have 2x rx470 4gb and 1x hd 7950 and I get 615 h/s with 440w consumtion. I have them all undervoltet. If stock, rig is working at 540w. I have opportunuty to get msi rx480 4gb for 220 but am not shure to buy it.
For the best H/$ you need to look at the Fiji cards. The R9 Fury is about 345H/$260 running all out and 300H/$260 running efficiently.
Edit: For the best H/W you need to look at the 1070. The H/$ on the 1070 is quite a bit higher than the Fury though.
For the most efficient overall gpu with a future other than just Zcash is the RX 470. Getting them in the USA for about $164 and getting 231Hs = $/H = 164/231 = $0.71 cents per hash (use this measure is for purchasing).
Long term you need to evaluate the Hash per Watt = H/W. You want this number to be as large as possible to be most efficient.
Each RX470 is reading an ave of 70W on GPU-Z. Hash per gpu is 231Hs. H/W = 231Hs/70W = 3.3Hash per watt.
Whole system (7GPUs) at the wall is 1623Hs/1258Watts = 1.29Hs/W
*Hs = SOLs = Hash
I think that when buying GPUs for mining other important factor is resale value. I know a lot of guys that have free electricity but instead of R9 390s they got for RX 470 because in case something change they will always be able to sell them to gamers.