I have run my card at 236/398 before. It gets about 3/4 way through 3DMark2001 and locks up. Best 3DMark2001 score WITH stability 4380 with 22.50 drivers at 230/390. I usually just run at default clock speed....why burn up the card ? I overclock once in awhile to see if the new drivers get a higher score, or are more stable. Right now the card still runs everything I play without any problems (how long will that last?). Plenty of Frame per Second in this puppy for now.
AMD Phenom II 955 BE
4 gig Muskin DDR2 HP
EVGA 8800GT Akimbo
WD Raptor 74gig SATA 150 10,000 rpm
2 Hitachi 120gig 7200rpm SATA 150
30gig WD 7200
Dual Boot: Windows 7 x64:Windows XP Pro