Could be a motherboard incompatibility with the memory..
I'd send Mushkin an e-mail and let them know about it. They might recommend you try boosting the voltage even further or they might recommend you RMA the RAM, or they might recommend you buy something different due to possible compatibility problems..
That's some bad luck you've got there
You might have to buy memory that's on the motherboard vendor's QVL list of compatible memory for that motherboard and then try updating the BIOS.. And then maybe the Mushkin sticks might work.. Or they might be bad..
Whatever you do, don't try to update your BIOS with unstable memory or you'll ruin your motherboard..
It could be your RAM or it could just be a compatibility problem between your motherboard and your RAM.
Onboard RAID vs. 3Ware RAIDI never recommend people run RAID-5 with onboard chipsets.