This link should be of help.
http://store.apple.com/us/browse/home/shop_mac/family/mac_pro?mco=MTE2NjQ
You know, it’s Apple customers who, instead of offering help to simple questions, instead try to be cute by recommending Apple systems. Frankly, it’s posts like that that have caused me to swear I’ll never become an Apple customer.
Yet another reason why macs are looked on with disdain