Quote Originally Posted by ThatGuy16 View Post
i have the X38-DS4, so i think its ok to post my issue in this thread.

I just got my second 3870 for crossfire. Now my OC is unstable (445x9), resulting in hard lock ups. Stock clocks are fine, so my guess is the NB need more voltage, agree?

i have no idea what in bios to change for the NB voltage, any suggestions will be appreciated!
You need to rise the FSB VOLTAGE OVERCONTROL on your M.I.T. BIOS section.

You might also want to try rising the (G)MCH OVERVOLTAGE CONTROL, which is the memory controller bus.