Thanks for checking that out for me. I did not realise you had updated your last post until just now.
As I suspected the Hypertransport issue is not unique to me but a BIOS problem. This isn't as urgent a problem as you can still use the multiplier slider in AMD Overdrive. I hope that they fix this soon. In fact I wish they would change it to a straight multiplier option instead of frequency selection.

Useful to know that 200X12 Northbridge worked for you. Especially considering you lowered your NB VID. That could mean it's my CPU's northbridge with the problem. I will have to try that again once the motherboard is returned.

Yes your level 3 cache copy test is definitely weird. Strangely high. Better unusually high as opposed to low I suppose.

I just thought of something the other day. Has anyone had any success with increasing SBcore voltage (either in BIOS or AMD Overdrive)?? Many say that SB600 limits overclocking potential. I just wondered if increasing its voltage would mitigate that somewhat.