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I have an AMD FX-8350 on an ASUS Sabertooth 990FX/Gen3 R2.0 with 4 x 8GB of Corsair Vengeance LP DDR3-1866. (I do have a justification for having so much RAM but it's not really relevant here.)

I've noticed that when the C6 Power State is enabled in my UEFI, I lose about 26 MB of RAM. When C6 is disabled, all the RAM I expect to have is listed. The machine survives (meaning, zero errors) four passes of memtest86 with either setting, so I assume there's nothing wrong with my RAM or my IMC, but I'm intensely curious about why I lose a small amount of RAM by enabling a simple power-saving feature.

Any thoughts are appreciated.

Edit: Apparently I can't do arithmetic while I've got a few drinks in me. Enabling C6 power state in the UEFI causes me to lose 16 MB of RAM, not 26. Incidentally, that's precisely how much L2 + L3 cache I have. This makes sense, given the research I've done on the C6 Power State.
Edited by frog7877 - 6/14/13 at 3:42pm