I have reached my target of 4.5GHz 500FSB 1:1 w/ RAM last night. I had to crank the voltage up somewhat high(1.4375V) and it causes the temps to be unreasonably high (65C+) to keep it there. The system remains quite stable playing Oblivion, Counter Strike Source and benchmarks, but under Orthos Prime SP2004 it cannot even pass a minute of small FFT testing on both cores. I will probably back it down to 4.25 and keep it there.
I got it there w/ the following:
PCPower&Cooling Silencer 610
MSI P35 Neo2-FR
Mushkin PC6400 996533 rated 4.5.4.11 2T(set to 5.5.5.15 2T @ 1000)
Thermalright Ultra 120 Extreme w/ S-Flex 63CFM fan
Scootz