Nehalem or i7 box?

[CrimsonGT]

So I made a post a few weeks ago trying to get an idea for the servers im building. Not really in a rush as we still have a couple months until our planned date to open. I was originally comparing the Nehalem 5520 to the 5420's but I decided the new architecture is definitely worth going with. I am placing my order tommorow so I figured I would throw this up just to make my final decision.

 

I am still pretty sure I am going to go with the dual quad setup with the Nehalem 5520's, but was also considering possibly going with a single i7s instead. Heres the two builds I am debating between...

 

I havent decided on a case/psu yet so I just listed the basics. Curious as to what wattage im going to need for a server setup.

 

Dual Quad Nehalems:

Processors (2) - http://www.newegg.com/Product/Product.aspx?Item=N82E16819117185

Motherboard - http://www.newegg.com/Product/Product.aspx?Item=N82E16813182192

Memory (12GB) - http://www.newegg.com/Product/Product.aspx?Item=N82E16820145220

Hard Drive (250gb x2) - http://www.newegg.com/Product/Product.aspx?Item=N82E16822148262

 

 

Single Quad i7:

Processor - http://www.newegg.com/Product/Product.aspx?Item=N82E16819115211

 

Found some ratings on this website. Not how applicable they are to game servers, but it gives a little bit of an idea anyways.

 

http://www.cpubenchmark.net/cpu_list.php

 

The i7 that I listed is ranked #1 among single quad core processors, and the dual nehalem 5520s are ranked #7 being beaten out only by much strong processors. My only worry with the i7 is that its a desktop processor.

[Creed3020]

Someone please correct me if I am wrong but with Server Build #1 the motherboard you listed uses registered memory and the memory you have listed is not registered. Will the two still work together?