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My 770 EX OC won't go much further than the factory OC, my best on Valley so far is 2127 ... 770@1327/3855, i7-4770K @ 4.6
AMD HD7990 (1109/6500)
Intel i7 3770k @ 4.4Ghz
I dont think this is correct..
There is no way your 7990 when under clocked vs mine is over 400 points faster.
have you tweaked the CCC?
a 7990 can not beat a 7970 CF setup which is higher clocked. Its just not possible
http://forums.overclockers.co.uk/showpost.php?p=23834818&postcount=562