Core Temp is indeed a good tool, as is RealTemp. If you're looking to replace the stock cooler, talk to Novatech about what they offer and consider it if you're going to be pushing the system with new games or high-end graphics work on a regular basis. If you're just going to run the machine under "normal" conditions most of the time, you should be OK with what shipped with the machine.
Thanks for the reply, I've been doing some more investigation and according to Core Temp the highest temp in normal use is 80C. Thats whist running BOINC when the machine is idle.
I found the Intel Extreme Tuning Utility and the benchmark achieved, is right in the middle of other people benchmarks for the same MB and processor.
I am still getting BSOD's and unexpected stops, though this time they are appearing in the Action Centre. They didn't before. It is not possible to analyse the minidump as it got deleted by accident (CCleaner, I didn't realise it deleted mindumps).
I suspect that there was more than one cause, now the processor has been replaced the underlying problem is revealed.
I am no nearer a solution. Overheating is an issue, but, I think not the cause. As the previous processor failed, probably due to the overheating. It exacerbated the underlying problem.
This is not my area of expertise, I am picking things up from the Internet, but am still not clear or confident about the problem. I have ensured the drivers are all upto date, there have been multiple memory and disk tests.
What else can I do? WHo else can I ask?