I have bought 3 of these now and there is two versions a slightly better then the other kinda differents the (pro) version has 4 sata data on the MB and there's two CPUs Intel I3 3.30ghz and the pro has a Intel I5 3.40ghz I don't know if there is any other differences in speed with cause either way both PCs are great for the price and what you get! One of the 3 died on me one day it just didn't trigger the display to turn on it wouldn't do any thing then the fan would speed up super fast never got it to work again that lasted 6 months I was not so gentle with this one tho so most likely it died from my actions! Great Buys 👍 this one was delivered today and it has a scratched up case 🙄