How to set up GTL Ref Values for 45nm & 65nm

[Razzz]

I have the MSI P45 Diamond and I cant get it to post at 400FSB. Im using a Q9550.
My BIOS looks like this:

I can adjust the CPU GTL and the MCH GTL in small steps and If I have understood this right, I should let it be somewhere between 0,8 and 1,0? I don't have to do the calculation.
I have tried to just adjust the MCH GTL to 0,6369v and then left everything else on auto, that works ok up until about 375FSB. If I want it to boot at 380 I have to change that setting to auto and put a very high vMCH and VTT.
Any ideas what I should set the CPU GTL and MHC GTL to make it boot at 400FSB if that's even possible? I know it's not an extreme motherboard and its a quad, but 400FSB? I'm looking for bench-settings.