I'm currently in the market for a 7970 for mining. On the MHC wiki, some 7970's can go around 750 MH/s, but after browsing many forums, people seem to be frequently having trouble with 7970s, resulting in speeds closer to 500 MH/s.
I think the most common problem for those stuck around ~500Kh/s is not using the "-g 2" option in cgminer. I was stuck around there until I figured it out. A lot of the configurations that people post around mining forums are for 7950s which seem to work better with "-g 1" (the default, I believe) but higher intensities.
So, which 7970 is currently the best to get?
(I'm looking mainly at cards with NON-reference coolers, and an unlocked voltage is good to overclock and get more MH/s!)
(I'm looking mainly at cards with NON-reference coolers, and an unlocked voltage is good to overclock and get more MH/s!)
I'm very happy with my Sapphire cards and the general consensus seems to be that Sapphire has among the best cards. All of my Sapphires (7950 and 7970) have unlocked voltage. My cards all have the "Dual-X" cooler with a large heatsink and two big fans. It seems to work reasonably well but I wouldn't attempt to put more than one of these cards in/on a system without PCI-E risers (because of the cooler, the card takes up 3 slots).
Also, do any of you have the 7970? If so, which brand, and what speeds are you looking at?
See above.
