haha nice build there mark, pretty neat setup there and i can see alotta money and time put into it. best over clock i got was 4.1GHz stable outta a 3.2GHz Phenom II x6 on air. but at the end of the day i underclocked my pc as the computer has MORE than enough performance for what i do(a random game here or there) and mainly acting as a data server.my PC specs below:

Processor: AMD Phenom II X6 1090T 3.2GHz
RAM: 16G Gskill Ripjaw Ram 1600mhz (4x4GB Kit)
Main HDD: Kingston 120GB SSD
Secondary HDDs: Mixture of 7 Hdds totaling 13TB
Graphics: Nvidia GTX560(was a freebie off a mate, before that i had a ATI HD5560... LOL)
PSU: Lian Li 1000w PSU
CPU Cooler: Coolermaster V10(its a monstrosity, and really loud but meh =P)