What is best processor for complex excel workbook?

[developer1000]

Hello - Can you please advise; I am running very complex excel workbooks with
thousands of formulas, which may take 60 seconds or more to regenerate
when a change is made. Assuming I max out at 8GB ram, what would be
the best type and specific CPU chip to use to speed this up?

Assume the spreadsheet is optimized, so the only change that can be made
is in the CPU. I don't want to buy a high end I7, for example, if it wouldn't
make that much difference, as I am not sure if the increased CPU capacity
translates into improved performance on this specific excel application.

I have read that sometimes increased CPU capacity may not make much
difference on excel because of the processes involved, which I find hard
to believe. But would appreciate your input.

Thank you!