The latest. My Samsung looks almost like the picture above except there is only one of each. I stopped while I was out this morning and picked up a DP cable. I connected it directly to the PC and everything came up fine. Answers the question that the 8950 onboard graphics indeed does support 2560/1440. My next effort will be to buy a multi port DP device, install my current adapter and an hdmi cable to the second monitor. I am hoping that will solve this issue.   
I just bought an 8950 only to find that it will not support 2560 x 1440 graphics that I need for my primary monitor. I use this system for spreadsheets etc., I am not a GAMER. Can anyone help me with an idea as to what I could add to improve the performance that I need? Or would I be better off to just return it and try something else? Kent
XPS 8950, graphics add-on