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Your shader speed is more important than the core speed. Core speeds over 700 will mostly just make it less stable. Drop your core down to 666, and push the shaders up and see what fps you get then. I expect to get 740 or so on the 285s, but not on my 260s. One of my 216sp 260s is a 65nm, and it does as well as the 55nm one. I believe I can do 1580 shaders with the core at 666, but I'm not willing to push more volts into them, they are slated for my folding box so I don't want to kill them!
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