Ok so I've scoured the internet for 2-3 days but I can't find any recent information about the Xeon 5160.
I have a gaming PC with a Phenom X4 9950 Black Edition running at 2.8Ghz and I've come across a motherboard with dual Xeon 5160s running at 3.0Ghz. Which is better??
Passmark gives the 9950 a 3.027 and dual 5160s a 3.954.
The only information I have been able to find relating to gaming on the 5160s is that most games cannot use all 8 cores so I wouldn't be any better off with 2 CPUs. However, none of the posts that I read were after 2009.
Both motherboards have 4gb ram and either way I'll use my Radeon HD 5870 GPU.
More about :dual xeon 5160 phenom 9950 black edition
Stick with the 9550, Its the same as in my current rig (Upgrading in a few weeks time). There is no point in running a dual xeon setup as ECC Ram will be required which will be generally more expensive and will be "much" slower than non ecc. Your best sticking with your current setup.