I would like to buy a R9 280X that is voltage unlocked so I can undervolt it for max efficiency while mining litecoins and to make its power consumption fit my 650 W PSU better (I will be using it in XFire with my 7950). I would preferably like one with the best cooling, for my peace of mind. On the web I read conflicting reports, I was just about to pull the trigger on a Sapphire Toxic R9 280X until I read that it might be locked (WTF Sapphire? I thought this was your highest-end model? Even my lowly 7950 Dual-X Boost is unlocked). Flashing BIOSes to unlock them is also something I would just rather not do. I really wanted the Toxic because I could also get closer to GeForce 780 performance while playing games not supporting XFire, or unleash its full power after I upgraded to a 850 W PSU.