Hello all,

I am facing a problem with my new setup, and I could use some help. I have the Gigabyte 790X-DS4 and untill recently I was using an AMD x2 4850e, so the RAM was operating at 800Mhz. I thought it was normal, because of the CPU, so I bought a Phenom x3 8750 Black Edition so that I could take advantage of the RAM's 1066Mhz.

Well, it turns out that bios now sees RAM as 667Mhz but, now I have the option for 1066Mhz in bios settings(not available while using 4850e). When I set it at 800Mhz it works fine, but I haven't managed to get it running at 1066Mhz. I tried ganged / unganged and the CPU at default speed, but the system reported an error, or even worse I ended up with a black screen and I had to clear cmos. PSU is Thermaltake 750W Crossfire certified, not a problem I guess. Any ideas?