Hi, I have a gigabyte z68x ud4 b3 board bios F10. I upgraded from 2 to 4 sticks of 1333 memory for 8G (non XMP). The sticks are tested good, but the system has suddenly become unstable, and i'm sure the problem is that the 4 memory slots are now filled and i need to increase the memory voltage. But I can't do it. The only place where I have the option to do it is in "Advanced Voltage Settings" It seems I can increase the memory voltage to any value I want, but it doesn't work. I put "DRAM voltage" at 1.600V, but it stays at 1.5V everywhere I look. Why is this locked at 1.5V?