I recently bought an ASUS Radeon 5870. I was really surprised when it was able to overclock so well. I used MSI Afterburner and cranked it all the way up to 1000mhz with no problems. I ran MSI Kombustor flawlessly. My temps capped at around 68-70 when running the stress test. I am using 1250V. Would you guys recommend going higher than I currently am? Btw... When I try and increase my clocks by even 50 mhz, i crash.. (probably because I am not increasing voltage).