First of all, you probably do not need to update your BIOS. Relieved, yes.
Your problem is that you are inadvertently trying to overclock your RAM. Change your System Memory Multiplier from 4.00D to 2.00B. You will see your RAM clock drop down to twice the FSB (848 MHz.).
That should fix your problem.
And leave your PCIe bus freq at 100 MHz.