P55 Overclocking Showdown - ASUS, Gigabyte, and EVGA at the OC Corral
 

Here is a really nice little review geared towards the bencher on the EVGA P55 FTW SLI E657, ASUS ROG Maximus III Formula, Gigabyte GA-P55- UD6, and EVGA P55 Classified 200 mobos. Raja has a niced break down of what RTL is as well.

http://www.anandtech.com/mb/showdoc.aspx?i=3671&p=1