With the temporary 8500GT I was using I overclocked it and after it crashed from raising the memory too much and I restarted I could NOT overclock at all unless I linked the clocks. Rivatuner would simply not overclock, the overclock I set would be ignored unless the clocks were linked. I reinstalled the program last time and the result was the same. Now it's a serious issue because the same thing happened with my GTX280. The system crashed from raising the RAM frequency too much just like I did with the 8500GT. Now it ignores any overclock I set unless the clocks are linked which is terrible! I had it stable at 760MHz and was going to try higher but with the clocks linked I won't be able to even set it to 700MHz. The last time I tried reinstalling Rivatuner but that did nothing. Anyone have any ideas what's wrong?