I ran a couple of tests on 3DMark06 after i turned up the speeds and the card actually got worse fps...its weird....these are the scores at the certain speeds, btw i only ran the first set of graphics tests.
Stock test: Core: 760 Mem: 1125
Score: 5917
1st OC: Core: 770 Mem:1137
Score: 5857
2nd OC: Core: 780 Mem: 1147
Score: 5858
3rd OC: Core: 800 Mem: 1172
Score: 5633