Now I am getting a really good offer from a person selling a z400 workstation equipped with an xeon W3520. Now I did all the research i could and gathered my facts and i just want to know what you guys think is better before i make my final decision. I've read from many post that the W3520 is basically a i7 920 server version and they're essentially the same thing except for the fact that the W3520 supports ECC ram. Now I also wanted to know since it is LGA1366 socket can i pair it with a different x58 chipset motherboard that supports overclocking and ddr3 1600 mhz ram rather than the stock one? The main reason why I'm buying the workstation is because i7 920 is not available in my budget meanwhile this z400 workstation is... which doesn't really make sense to me since they're the same thing. I also read that the xeon's can overclock well too. Right now this system is looking to be good so far. I don't plan on running this system with the stock hardware, I Plan on changing the Ram, motherboard, casing, Graphics card, power supply. So to summarize from my previous post: W3520 = i7 920 > i7 860 > i5 750. Am i correct to assume this? Also W3520 is the cheapest to get from them all.