Plus Ecc memory and dual graphic cards for the pro.  Bu if your software is multi-core I guess its the way to go, but if your just using 4 cores, the iMac 5k is pretty competetive if not faster[1] and significantly cheeper.<p>[1]<a href="http:&#x2F;&#x2F;barefeats.com&#x2F;imac5k.html" rel="nofollow">http:&#x2F;&#x2F;barefeats.com&#x2F;imac5k.html</a>