Ok to start with your question, if 4 cores are enabled, the AOD or any other monitoring device that I have used will not show the right temps for the 4 cores. Only the cpu temps will be fine. With 3 cores it will show the rite temps so thats pretty normal, dont worry abt it.
Are u using an aftermarket cooler. If you are try for 3.4. You could get to 3.2-3.3 on stock volts and 3.4 at around 1.375-1.425. Cheers and welcome.
In other news the 955BE has broke the WC for a quadcore overclock at 6.5 Ghz, under LN2. This has got to be great news for AMD and the OC community at large. The 955BE is running the core i7 pretty close and trashes it in OC results and benches.
@hybrid, welcome to the club, have been travelling a lot for the last week so will add the names for OC and club members as soon as I get home.