I have a Mac Pro with the X1900XT video card. Looking at the back of the Mac I have a Dell 2405FPW hooked to the right-side DVI port and my VIZIO 50" Plasma hooked to the left-side DVI port with a DVI to HDMI cable. I do get a great picture and everything seems to be fine except there is no resolution option for 1366x768. Now this is not anyting new, most video cards are not capable of this resolution because the 1366 is not divisible by 8bits but most cards (including the Xbox 360 via RGB) allows 1360x768 which looks great and is the best option. Right now I have it set to 1280x720 which is displayed with about a 2" border around the screen. So if anyone has any ideas on how to get the Mac Pro to output 1366x768 or 1360x768 as a second display on the X1900 that would be great.