I've also been doing some tweaking and it seems I hit a FSB wall at 432Mhz, at 433Mhz the boot process gets stuck at DETDRAM even though I've tested the ram to work at 1200Mhz at 1.80v.
I probably have a FSB Hole around the 433-440Mhz or so mark but I haven't really tested that out.
But this fails P95+UT2004 Blend very quickly.
As you can see memory is not the issue, the problem is almost certainly FSB Termination voltage however LinX failed at voltages from 1.30-1.36v (around 1.36-1.42v Real)

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Any suggestions??
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