In the bios it says 1333MHz. In CPU-Z it says 686. I have an FX 4100 @ 3.6GHz, my mobo is M5A97 Evo.
I can't find anywhere at all about where it says how much RAM is supported, etc for either of the products as the websites are crap. I changed the RAM freq. in the BIOS settings to 1866, then I got a blue screen.