This is sooo annoying, i've been getting this error since i set my old triple kit 12gb 2000mhz dominator gt's to 1866mhz & i'm still getting it even after buying a new quad 4x4gb 2133mhz dominator gt kit, everytime i set it to X.M.P. i get this annoying error (System Unstable. Your CPU Ratio may be down at 12x due to unsuitable conditions). Even when i set the new DIMMs to 1866mhz, i get that message now and then, it's really annoying me & i don't want to start regretting upgrading to a Rampage mb. Please tell me what to do in order to avoid the so called "instability" that the mb claims.
PS. i even tried increasing DRAM voltages, CPU PLL Voltage & VTT voltage but nothing worked, even set the timing manually,even ran memtest for 1 hour 25 minutes ( http://img827.imageshack.us/img827/8849/memtestorg.jpg ) but i still get that message now and then (mostly after the following startup of a successful post). I have latest BIOS too (1101).
UPDATE: Overclocked CPU because i was sure that i should either use OC'd ram along with OC'd cpu or just use both at very stock, so i just OC'd CPU to a stable 4.7GHz & DIMMs are now running at 2133MHz as well, all stable.