Cool, we can put that one to bed then.
Note; a 3770 being used on a 'Z' chipset can be over clocked using the turbo multiplyers to 3.9 gig per core.. On all four cores at once. (a crafty 500 megahurtz overclock!)
The wafty lenovo board would not let you do that?
http://forums.anandtech.com/showthread.php?t=2261588
{many people here know about this..)
Good luck with it, and see you in about 4 years,when you wont be able to replace that motherboard.Dont forget to pick a solution.!