Quote Originally Posted by Rectal Prolapse
GAM, both versions of Mushkin RAM (XP2-6400 1GB and EM2-6400 1GB sticks) support 1.8V. But I'm pretty sure 1.8V only at low frequencies (@533 MHz is my guess).

On my DQ6, FSB voltage is set to Normal, which means automatically controlled by the BIOS and Easytunes tells me 2.1V when I run 1:1 at 375MHz FSB.
You mean vDimm set to Normal?

Although both sticks 'support' 1.8v, it looks like the XP2's 'want' or 'prefer' 2.1v. The EM2's on the other hand 'prefer' (or are happier) with 1.9v. [Info gleaned from a couple of web reviews so accuracy is not verified.]

That said, you experienced issues with the EM2's or the XP2's? (I am hoping you're going to say the XP2's )