Paxoman, is that a typo for 'KT7-RAID' in your sig? Just wondered, cos you mention PC150 mem, not DDR, and I didn't think the KG7 was out yet available yet. Mind you, a KT7-RAID wouldn't do 133fsb, so that wouldn't make sense - KT7a-RAID maybe?
Anyway, as for your question - what PCI cards do you have? I suppose you might just be extremely unlucky and have a network card or something that doesn't like running at all out of spec. You could always try raising the multipler from 10.5 to 11, and just running 133MHz fsb - if your cpu can handle it, that'd give you 1466MHz. If that works, that'd suggest it's something other than the cpu holding you back.