Some of those settings at high for 450FSB, even if it was set to more stressful 1:1 Ratio!

You need to find a good NB GTL setting not leave at auto and CPU GTL's should not really be +or - 70 if you worked out the calculations!

I had issues over 425FSB till I set NB to +40, then its a brick wall at 475FSB same as most users find with a Quad and very hard to get past it unless your lucky with a good sample Mobo!

I got some 1200mhz Memory the other day to see if its really easier to do 5:6 over 1:1 and even though it runs them at 1200mhz I still cannot get any higher FSB that is 100% stable, 500FSB for me is not going to happen on a Quad only my older Dual.

Mobo lacks any real support and Bioses were crap!