Ok... just thought I'd share... The stock Apple supplied nVidia 7600GT on the 24" iMac clocks in at 500Mhz Core speed and 575Mhz Memory speed... Using the "Coolbits" registry edit, I have enabled the built-in nVidia over clocking utility. There is a *detect optimal frequencies* button, which supposedly will detect the best settings that can be *reliably* run on your system. After the nVidia software goes through it's paces... it suggested the following settings: Core @ 563Mhz, Memory at 733Mhz Thats a nice jump... I'm off to see how stable it is... More information if and when events warrant!