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with the gamerock already overclocked to 1845 on bios 1 in thundermaster set over clocking to max power, then start at 100mhz on the clock, because these are already 1845 it will take you to 1950mhz which it will then boost past to 2100mhz its depending on cooling if it can hold that, set memory to + 400 and you will be good to go. make sure fans set to 100%
also make sure in Nvidia control panel set to MAX power and set to performance mode. try that.
that pushed my graphics card to 2055mhz and the score from 20,244 to 21,098.
I guess I should look at cpu overclocking next. Not that I will use it much just wanted to see how far I could push my hardware.