I hate to be the bearer of bad news, but a data center is not going to rent two servers from you. In fact, no data center I've ever been associated with or heard of "rents" servers. If they are leasing anything, it would normally be direct from a manufacturer such as Dell, HP, or IBM or a large leasing company like CDW.
Most facilities are going to lean towards the larger manufacturers because they standardize on equipment, support, and replacement parts.
Additionally - I'm not a CPU expert, but it sounds like you have the desktop versions of those processors. I believe they just came out with the server (Xeon) versions. You're best of just keeping them for your own use, whatever it may be.
I would be better off flogging them then. And yes, they are High-end desktop/Low-end server CPU's but are pretty powerful, ideal for Gaming/Small Business's network. It was a idea someone had surgested to me, so i thought I'd better check that it is a good idea on here, but clearly not.
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I would imagine you're going to have a hard time renting the servers to a datacenter. They are going to want hardware warranty's and probably new hardware, not something from someone coming in off the street with them.
But the servers can surport up to 40 Pc's each. So its ideal for small business's which I think is what the guy wanted it for.
It is a decent computer. But servers don't overclock. Servers typically use ECC ram. There are way too many dediated server host people selling non-ecc based Core2Quads because "Google" used to buy crappy celerons. That is a myth, because nobody in this world has Google's infallable software infrastructure to support non-ECC ram based servers.
The i7-Extreme CPU was designed for people who had too much money burning a hole in their pocket, who by the way, don't know jack squat about hardware in the first place. If you really want to overclock an i7 based CPU for server usage, I would have done it with a Xeon W3520 D0, which will easily do 3.6Ghz-4.0Ghz, and supports ECC ram for only $300 on the market. Why would you get 4.0Ghz from an i7 Extreme(which isn't D0 for the first batch it came out)?
When someone offers you 2799 pounds for an overclocked i7, you sell it to them with a big smile on your face, because once they found out what they really bought, they probably don't want to see you again
Edit to the last post. I just checked Intel Processor sspec website and i7-Extreme 965 was C0 when it was launched, but i7-975 was D0 when it launched. The argument still doesn't change, when Xeons 35xx and 55xx are all guaranteed to be D0s and offer ECC support and higher temperature tolerance.