I agree, it would be an expensive test. That's why I was looking for a definitive yes or no from Intel or Microsoft and neither of them said anythinh but send me links to read all kinds of technical jargon that didn't correlate very well, if at all.
When I called their engineers out on the lack of knowledge and support, they went silent.
As I do not have a more modern system to compare this to, I don't suppose the difference in performance will be of great importance to me.
Given that my compilers will use multiple threads to work, 8 cpu cores - threads - means a practically instant compile.