yup, I thinkt he max stable I could push it was 772 core and 3 ghz memory, and I usually game at 745 mhz when playing Crysis for fun. I ran ATItool to scan for artifacts at 772, and got nothing for 10 minutes. I didn't try anything longer just because I was bored.
BUt overall when COD5 or left 4 dead, I disable Sli and run OCX speeds.
I too don;'t like keeping the GPU pushed:D
But I mostly game on ps3 and laptop now.
Grid and Wheelman on the run, and RE5, Gundam and FIFA 09 on the ps3:P