This is the highest I could get my GTX 660's in SLI to do.
Their overclocked to 1241Mhz max.
Memory Is At 6302Mhz Effective.
Power limiter upped from 110% to 150%.
Voltage is at 1.212 Volts.
The card is an ASUS GeForce GTX 660 OC, with ASUS GeForce GTX 660 TOP bios.
The TOP bios was modded using KGB, Kepler Golden Bios.
The card needed the core downclocked 40Mhz to be stable.
Same settings on both cards. 3770k @ 4.5Ghz & 16GB @ 2133Mhz, ASrock Extreme4 Z77
I'm glad I got my GTX 660's instead of a GTX 680.