The 7970 and the 7950 are identical efficent in theory.Why do you rate the difference as "nowhere near"?
Any examples or experiences? (So far i tested 7970, 5970 and 6870)
I recognised that some manufatures are better than others.
so i gett only 710khash out of the possible 800khash.
With your power costs, you need to get a cheap asci, like the AM BE. Then mine and dump a SHA256 coin. ZET is hot right now. But I would dump it and buy and hold HBN for the SUPER efficient stake.
If you would like to take a gamble on an ASCI miner and help your fellow man out, see my sign.