Well, I just tried 0903 and it is quite simply atrocious.
It is causing ntfs.sys errors, where-as previously everything was fine with 0901.
Is it forcing a higher PCI-E frequency or something? I've locked it to 100, but I remember reading that ntfs.sys errors are usually associated with the PCI-E frequencies being pushed too hard.
Hmm.. odd, the voltages seemed fine according to hardware monitor, so I'm not sure why 0903 is so unstable for me