U mean u get that annoying 'DET RAM' hang? I found out this is related to Dividers, so changing strap can help this or Disable Transaction booster relax level: 0 or 1. I found out that after 450FSB, transaction booster enabled wont work with 400 strap on my board, no matter how much NBv u bump it just get that DET RAM hang. However 333 strap works very nice for high fsb, thus I use 333 strap if I want to use 450FSB+ but u have to disable Transaction booster for using 333 strap, and I found the odd thing when using 333 strap, 1:1 set in BIOS doesnt work , but u have to set AUTO then it POST np at all, or the 5:6 divider works aswell.

*edit and the BIOS I am using is 0907.