When I upgraded to the new drivers I was able to overclock my card to 378/270 and it is stable, where as before it would freeze above 337/243. So this is an improvement!!
Here's mine for what its worth. Are these good? I have a 8600 with 60gb 7200 rpm
0.5 2761/ 5839
1.0 5471/ 11731
2.0 10332/22815
4.0 18390/41096
8.0 31868/61253
16.0 49710/70597
32.0 51909/83886
64.0 57148/88080
128.0...
I had the same problem. I barely overclocked my card (354/250) and the screen locked-up and everything looked like a lava lamp(melting). I had to immediately remove the battery to turn it off. I still have problems with minimal...