Umm... just NO! If you take a XEON and an i5/i7 that is from the same gen and has the same specs, they will perform exactly the same in games. The fact that it is a XEON does not make it bad for games. Those 12 core CPUs are going to be running at a lot lower speed than a lower core count processor, and that is what is making the difference. RAM speed also makes a difference as well.