I think it's kinda bull crap to say that a Xeon would be better than a Core i7/Core i5 for gaming. The chips both have the same architecture, the Xeon chips are just optimized for lower temps etc. Plus they have the ECC memory controller. They're made for servers, they're not any more powerful, just more reliable/cooler. So if you're not running a 80%+ capacity all the time, you'll just be throwing your money away. I'd take a
Core i7-3770K any day!