Hi all,
I've got a strange issue: the system below works fine with 2GB of RAM, but as soon as I add a third, it refuses to overclock--at all. If I enter setup and enable overclocking, but don't even change the frequency--that is, that I keep it at stock MHz--it will refuse to post, will reboot, and disable overclocking.

If I remove the third stick, I can go right back to my 24/7 overclock. Since I have 4 sticks, I've tried them all in various combinations, have vetted them with memtest, etc--it's not the RAM sticks themselves.

Have tried F4, F8, and F10 bioses; clear CMOS, etc.

Any clue? The RMA process will surely drive me to just get a different board, I think.