CPU and Computer setup are not as important as a reasonable refrash rate and some optimisations in conditions. For me, speed and fast calculation have less importance then overall system reliability.
It does not make sense to to buy a Intel I7-985 System with 12 threats at 2000 EUR to run a single Instance of MFPro. In my expirence, MFPro works fine with a outdated Athlon X2-64 System with 2 cores at 300 EUR if you can assure that MFPro can use a core alone.
2 GB RAM is minimum, fast harddisc is better than a big one.
I use a fanless and noiseless system with 4GB RAM, a 128GB SSD Drive and a Intel Q8400S Processor. Not a performance champion, but a reliable, quiet and powersaving worker.