Your not the only one Tyke, I have the same issue with QX9770 (but never tried with E8400)? What I did find out however, if I set FSB to 2000Mhz (unlinked or linked) the memory stays at 1900Mhz but once you increase the FSB to 2027Mhz or higher the memory will finally go up to same speed, very odd? Do you have any idea at all what might be causing the problem, this will make testing RAM at 2000Mhz very difficult to say the least! I tried different multipliers, unlinked, linked/synced, linked/auto, etc... but no luck at all! I wonder if there is any chance its a BIOS issues (I'm still using 0511), what BIOS are you running? I'm still working my way up from FSB1600Mhz x 9.0x (stability testing) so it will be a while before I'm seriously testing at speeds this high but I'd still very much like to know what is going on?