We dont know what exact xeon you have (model, socket), so we cant anwser that.
Intel, AMD and Xeon
The Mac Pro Desktop has a Mac Pro Desktop motherboard designed by Apple and incorporating many innovative features such as a removable tray mounting for the CPUs (Two Quad-Core Intel Xeon processors) and RAM to enable easy upgrades.
One possible solution for you is the Asus P6T7 SuperComputer motherboard. This MB is fully compatible with the Core i7 product line along with some Xeon processors (must use latest BIOS). I used this MB with an i7-950 and recently upgraded to a Xeon W3680. You can also use a manufacturer's motherboard configurator to find motherboards that support specific CPUs.
Dual cpu socket motherboards are for workstations/servers and won't fit in you typical case. Yes it boosts the performance.
xeon
Xeon was created in 1998.
No Xeon is a non-metal
There are a variety of Xeon dedicated server models in the market today. Some examples include the following models: Xeon E5 family and Xeon E3 family.
Yes, it works fine. I have the same motherboard and video card and it works flawlessly!
http://www.onlytorrents.com/torrent/halo-2-xeon-zip:568705191b8a6e53ed986029c8666811adba0ab3
The kind of processor you would expect with a PowerEdge 1950 is either Dual-Core Intel Xeon 5100, Xeon 5000 or Xeon Low Volt 5148 or Quad-Core Xeon 5300.
The Xeon. It is intended for high end workstations and servers.