I am glad to see this thread back. I thought all forum support for the XPS 730 x is dead.
I have a question for you Ph3nom or anyone else that would like to chime in. I have received my new Dominators 1600 Mhz 6GB RAM and tried to OC my CPU and Memory but I could not reach 1600Mhz like Ph3nom has reach. I am attaching a screen shot of my setting changes. Can you guys chime in on what I need to do to get the full speed of my CPU and Memory? I have a H2C i920 that I have OC to 3.3Ghz stable thus far. My BIOS is 1.5
Thanks
Joe

XPS 730x H2C
Intel Core i7 920 @ 3.3Ghz
Windows 7 Professional x64 
Sapphire HD 5870 Vapor-X 1GB
Dominator 6GB DDR3 @ 1333Mhz (soon to be upgraded to 1600Mhz)
Vertex 120GB SSD + 2 x 500GB WD 7.2K
Creative SoundBlaster X-Fi Xtreme Titanium
Dual 25" Monitors (2ms) 1920 x 1080 via HDMI cables
Logitech G15 Gaming keyboard
Logitech G7 Gaming mouse