I never had a DFI Toasty but for 450FSB ops I needed 1.5NB volts on the Maximus boards.. also your CPU VTT is way low.. try 1.2

Question for the Vcore : with the working settings eg 400FSB and you put in 1.28Vcore : it just won't post or doesn't it post with 1.28Vcore set and ya new settings ? if no post try 1.35 and work ya way down...

also why don't ya use the 9 multi and try 425FSB...