what a joke and you are only thinking of just CPU, while the mini using HD4000 GPU, plus limited Max memory.
Even opening any application the Mac Pro can beat the mini anything with such a big diff from a PCI-E SSD with 900mb/s to a HD in Mini even DIY to SDD is only just SATA3 6G speed only.
A lot of ppl are making the case for raid 0 ssds in the mac mini. That would increase the ssd speed to mac pro speeds. This may work but I think it also increases the chances of problems. This is one the reasons why I didn't mention it in my counter argument.