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Back in 2008 someone devised something called the ZDnet Clocker though it's on temporary. Dunno does it work with the newer macs.. but you can try!

Let us know what happens
 
does anyone know if i can overclock this puppy to 2.9 or 3.0ghz ? 😀
Unfortunately, you can't.

I'm not entirely sure, but isn't it simply cause server class boards for Xeon's don't allow (permit?) overclocking?
No access to the firmware, nor is there a utility that works on the 2009/10 systems to make the changes needed for it to happen.

But there are other boards you can do this (there are Workstation and Server boards, not just enthusiast/gaming boards).

Back in 2008 someone devised something called the ZDnet Clocker though it's on temporary. Dunno does it work with the newer macs.. but you can try!

Let us know what happens
2006 to 2008, Yes, but not with 2009/10 systems.
 
It depends what motherboard you use and if it permits overclocking. I have dual 3.33GHz 6-core Xeons overclocked.
 
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