We heard the overclocking headroom for GeForce 8800 GT is pretty impressive mainly due to the finer 65nm process technology. However, Nvidia has purposely limits the core clock at 600MHz so its performance won't get too close to the GeForce 8800 GTS thereby hurt its sales. However, users can still choose to overclock the core and we should be seeing more than 700MHz easily. However, if Radeon HD 2950PRO performance comes too close for comfort, Nvidia might increase the core clock further.