what is a xeon cpu

Try being a little more empathetic towards those who might not have as much experience with PC hardware. There has been a time when we were all in his shoes and looked to those on forums for answers and for more than maybe Google or Wiki could provide. Also, you have to take into account that maybe he was also wondering about experience with Xeons, what he could expect, possible alternatives, etc. Just because it wasn't asked, it's rather obvious there was a reason the question was posted to begin with.
 
I will also take a gander that this question was based on the fact that Intel released 15 new XEON chips today based on the 45nm process.

Info about those chips can be found here.............

http://processorfinder.intel.com/List.aspx?ProcFam=528&sSpec=&OrdCode=

Please note: All of these Chips use a "771" socket. Desktop Chips use the "775" Socket. So if you were to buy one of these XEONS, it would not work in your Desktop Motherboards. You would require a Desktop Motherboard. In addition, you would likely need Registered memory, which is a bit more expensive.

So Don't expect to be able to pop one of these in place of a Core2Duo.
 
Good point, Zenmaster.

All the Xeons (to my knowledge) are different sockets when compared to their desktop brethren. You will need a server board for them, and usually reg/ECC memory. Also, with server boards, you don't always find enthusiast extras on them since they are more often reserved for, well, being servers more often than being gaming machines. There are some out there that do offer all the expansion slots you need, as well as onboard sound, LAN and such, just be prepared to pay more for them as well as the chips...

The way that desktop vs. server processors scale today, its beneficial to go with desktop models since dual cores are quite mainstream and quads are finding their way to the scene. Both offer significant performance that a server chip would provide, but at a lower price since they don't require those pesky 24/7/365 'needs' a business usually has. :)
 
I stand corrected. It looks as if there are 775 socket Xeons. I knew there were 771 and 604 sockets...

I would double-check any motherboard (that's not listed as a server board for appropriate socket type) to make sure that it's compatible with Xeons. BIOS might not recognize it at all.

Good Googling, cfvh600...

:)
 
I would rather use this site than to google (wikipedia). I like to have different opinion about something and the info that you all provide i'm pretty much satisfied, I would say better than WIKIPEDIA....
I just started in computers almost 2 years ago. Now I can take it all apart and put it together, I can overclock, all my programing are free (from antivirus to operating system "VISTA ULTIMATE"). So do not underestimate the person that is curious about something because he might knowing more than you all...