I just did a big upgrade to an existing system. It uses G.Skill brand memory sticks, 4 gigs total, 2gb sticks rated at 1333 mhz.
After plugging them into the Gigabyte X58A-UD3R motherboard the bios read them at 1066 (lower than their rated setting), and timed them at 8, 8, 8, 20 (almost correct, should be 21).
So obviously I changed them to the appropriate settings for the memory. After a few days I boot my PC out of sleep mode, and it restarts, but then goes into a restart loop. Between restarts I unplug the PSU, then plug it in and it boots up. However, I got an error prompt saying that memory config differs from last time the PC was booted out of sleep mode and that I might lose settings saved before entering sleep mode. I ignored and booted up normally and now everything seems ok.
Is there a problem with the BIOS saving settings to CMOS? BIOS settings are how I left them, so Im a little confused...
CPU: Core I7 950
GPU: GTX 480
RAM: G.Skill DDR3 1333 x4gb
OS: Windows 7 64 bit
It could be the mobo battery crapping out( don't worry, they're cheap and easily replaced), or maybe held improperly, it happened to me a few times on other builds maybe once or twice, but then never happened again.
If it doesn't happen anymore you'll be fine, if it does it again within a few months replace the battery.