I was testing my new 7900GT's oc-capabilities, and installed ATI-tool... Seeing that the mem was only reading as 330, I thought there was some driverfault, automatically decreasing mem-clock to half... So I started moving the slider up, until it started showing artifacts in windows... I understood my mistake, and backed down again.... kept testing, and hit 1630 after an hour or so... started playing Quake 4, but when I exited the game (was running the mem at 1500 then), the screen started blinking, not reacting to clicks with the mouse... Every time the screen flashed, it was as though Windows had trouble popping back in...
I couldn't restart, so I hit the power-button... Going back into windows, I tested with 3dmark05 to see whetever that made the same thing happen.. it didn't...
Today I tried figuring out what the course was, and came to the conclusion, that the GFX-RAM suddenly wouldn't even go higher than 675 with neither Coolbits, nor Rivatuner (using the driver-tests)... Before my mistake, the auto-oc utility in Coolbits took the mem to 1564 no problem... The card has no problem running at default speed, so my question is, if I have fried my GFX-mem's oc-abilities... No RMA is possible, as the card operates fine at stock speeds... Returning the card on my right of return would cost me a good deal of time and money, and with examns coming up, I do not have the time...
What do I do??

Best Regards