All of you are (probably) aware of this, but with MSI Afterburner 1.4, one can alter the voltage of the 1GB 4870's, up to 1.35v. (From 1.20) While this isn't a huge boost, it does allow for a good amount more overclocking headroom, and you don't have to use any warranty-voiding hard mods. Using MSI Afterburner + Rivatuner, i was able to achieve 4890 Clocks, although i would freeze up around 855mhz Core. These clocks were stable in Borderlands and NFS: Shift. With an aftermarket cooler i'm sure i could break 860+ core on a 4870. Have any of you guys tried this method? If so, what were your results?