as this is called the thread for the first rig - is there also a known good combination for a second one?
i.e. a combination that runs stable with 4 7950s?
is there a clear "king" of 7950s which definitely runs at the efficiency stated by tacominer (~600 kh/s per card at 625 W from the wall)? I could only get to 750 W with 580 kh/s per card with voltage unlocked sapphire OCs.
Mine came with 1.250 stock voltage, 950 clock speed and 1250 memory.
For scrypt, I could get them down to 1.075 voltage at 1050 clock speed and 1418 memory. I cannot seem to find a better relation between hashrate and electricity usage. I read about people buying card that come with 0.9 stock voltage...
I looked through countless threads but I cannot find a description of a card that is guaranteed to be good. Since "sapphire 7950" is not enough since there will be vapor X and OC and 4L and whatnot, and even given this specification there will probably still be different subtypes.
Also, does anyone have a 7950 where the memory can be undervolted seperately? I tried the modded sapphire trixx version but no luck.
Also, what's up with this guy:
http://www.reddit.com/r/litecoin/comments/1cbg51/my_7950s_are_at_800k_somehowprt_scr/