i7 930, ASUS P6X58D, Corsair XMS3 DDR3-12800 1600 184.108.40.206
I have the CPU overclocked pretty high and in conjunction with that the system does not like higher memory speeds. I have the DRAM voltage set to 1.64, and QPI/DRAM frequency set to 1.35. These are the setting to implement higher speed memory frequencies, or so I understand.
The memory perfers a 6x DRAM multiplier rather than an 8x. This effectively means that when I OC at 4.0+ my memory frequency is around 1200 instead of 1600.
Does this make an effective difference?
At 1200Mhz am I then running the RAM at DDR3-10800?
Also I noticed that there is dual and triple channel DDR3. Am I at triple channel as I have a 3 x 2GB configuration?
My preference is to OC at 4.0+. If I drop the processor down to the 3.6 to the 3.8 range then I can get the 1600Mhz. But it seems like there is more benefit with the higher overclock.
I don't have much help to give you, but from what I have heard, I would say that the difference between 1200 MHz and 1600 MHz in gaming, as an example, would probably only be around 4 frames per second or so. So in any other real-time app. or otherwise you may not benefit very much from this jump in RAM speed.