I went for broke a few days ago and flashed mine to SLI with the v3.6 BIOS. I used AFUWIN440 for the flash...it was very easy. I was able to borrow another GTX275 for testing to verify. It works flawlessly. From 1.5 X-Fire version to 3.6 SLI version. Prime stable for 48 hours@ a mild o/c of 3GHz....(I did'nt need anymore than that for what I'm doing). The later BIOS adds a few entries that are not in the original X-Fire version. This has proven to be one stable board for me. I have not had one single hiccup since it was built in January and I use it every day.