Hi Kevin,
1. I have not overclocked the processor.
2. I have Linux installed, so I can't run the latest Processor Diagnostics Tool. The LiveCD version I found is version 1.17.1.0 from November 2011, is that good enough? Or can you point me to a version for Linux?
3. As above, I can't run DXDIAG since I'm on Linux.
Are there commands for Linux that can help?