^ No worries. Glad I could help.

Which brand is your card (e.g., HIS, PowerColor, Diamond, Sapphire)?

Also, are you able to run the memory at least 1100 at that core speed? I found that the highest stable I could achieve with the Diamond 4870 XOC BE on air was 875/1125 at 1.358V core, 1.501V memory and 850/1150 at slightly different voltages. Either way, I did not notice almost any performance gain when compared to say 825/1125...