I've noticed that my board overvolts everything, so I've had to set the CPU VTT voltage a bit differently than mentioned at http://www.clunk.org.uk/forums/12434-post9.html

However, the GTL settings do seem to be correct, once you get the CPU VTT voltage exactly the same as the "real" voltages mentioned at the page.

I'm now running 8x450 (3600MHz) with 1.328vcore , CPU VTT 1.310v, NB 1.510v. If I find these settings to be primestable, I'll post them here for ya