cTs Corvette said:
Well, looking at those specs, one of them calls for 1.65V and one calls for 1.5V, and it's the 2 x 2GB sticks that call for 1.65V. You shouldn't have an issue if you bump up the voltage enough to make the 2 x 2GB sticks happy-check in BIOS and see what voltage it's running at now, and if it is lower than 1.65V, bump it up and see if that solves it.
Probably your BIOS update killed your overclock, if you had one before. Or maybe the old version of the BIOS was better able to deal with 2 different voltage requirements.
Yep, ^ that is where I was heading too.
Mobos can handle all kind of RAM's, but different voltage between other sticks can do just this!