Not sure if this applies to everyone's boards, but mine seems to be very unstable between around 475 to 499 FSB. 470 FSB is fine, but it gets progressively less stable as it approaches 478 FSB, and is unstabilizable between 478 and 499 FSB. Sometimes at around 495 - 499 FSB, it won't even load windows.
For example, at 9 x 478 = 4302 MHz @ 1.28v it fails orthos in less than 2 mins, it doesn't make it to the 4th 8K test. However I'm currently testing 8.5 x 506 = 4301 MHz @ 1.28v all other settings the same (except the ram speed of course) and it has passed more than 2 sets of the 8K test and has been running error free for around 32 mins so far.
Perhaps it's worth testing if this applies to your board too, and although it may appear counter intuitive, going straight to 500 FSB from 470 - 499 FSB may help solve stability issues if you are experiencing them.
4301 Mhz (506 x 8.5) @ 1.27v - DDR2-1214 @ 1.96v - PL8
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