950mhz on core? isn't that too much? the maximum in the CCC is 960.
It all depends on your specific chip. These settings are the maximum that a decent number of people have reported overclocking to. Like I said, start there and then back down if the card doesn't like its clocks that high. You won't burn out your card - it will reset itself (freeze, then black screen, then pop back on with a message that says "display driver stopped responding and has recovered") if the overclock is too much. Back it down by 10Mhz on each until it stablizes in games.