I have a problem with my config and that may help me.
I'm able to reach 405FSB in certain bios settings with spd timings enabled. Once I disable them and set manual timings It won't boot over 320 FSB, even if the timings are the same they were before.

So I booted with manual timings (below 320FSB) and set TRFC to 42 manually by memset.
Guess what, I was able to reach 410FSB flawless!

Will SPDTool help me setting trfc to a correct value so my ram can boot?