If you have some Timing App, OC App e.g. AMD Overdrive, or ANY BIOS invasive App then yeah it's change your BIOS. It's the only explanation other than a bad COM Battery. Those Apps are crap so don't use them, you get stuff like this, overriding the BIOS.
1. Uninstall the Apps(s), 2. Try MSCONFIG -> select Diagnostic and reboot.
My DC mode (not sure what that is) says unganged...
DRAM Freq is 655.6 (it's fine)
FSB: DRAM is 3:8
and instead of Row Refresh cycle time I have something called "Bank cycle time" (tRC) and thats at 20 (any ideas on what that is?)
If your system is stable at 1N/1T then leave it otherwise use what I posted "DRAM Timing Mode -> 2N".
Your FSB will ALWAYS have some degree of fluctuation, to conserve energy your MOBO changes the CPU Multiplier and to some degree the FSB comes along for the ride. There are VERY, VERY few values that don't bob up and down depending on stress of the CPU.