Greets Gents -
I have a Sapphire hd 5850 1 GB I removed the stock cooler and Installed a Thermalright Spitfire and VRM-R5 Cooler, I run 975/1300 @ 1.225V. My temps in a 25 degree room are 31 at idle and 55 at full load running FurMark @ 1920x1080. I flashed the BIOS with the MSI binaries to unlock the vcore adjustment and I use MSI afterburner to overlock. One thing I would warn against with Afterburner is making a custom automatic fan setting, everytime the fan changes speed you video will stutter like crazy, better stick to a fixed fan speed instead.