Thanks for your reply Allan. Sound advice. Though I have already taken time to check these potential causes its always worth thinking about anything I might have missed. The BIOS is latest F4 version and I reseated the two heatsinks involved several times each. This appears to be a genuine hardware fault but it is currently unknown whether it is in the Mobo or the CPU. Hopefully we can find that out.
I have an update to add which is that after starting an online chat with my retailer I was able to perform a test using AIDA64 and sent them the output below which resulted in their recommendation that I send the CPU and motherboard to them for testing. You can just about read below that the throttling was at 19% with Intel stock HS/F with the mobo outside the case on a mobo tray. Core Temp recorded 3 of the cores reaching 100°C, expected temps were around 60°C. I reseated the Intel HS three times and it made no difference so CPU and mobo will be going to them on Monday. Hopefully they will replicate and confirm the fault so I won't get charged for the carriage and assessment ! Then hopefully they might find some answers and if they do I will relay them here.
