Went round a mates house today to test out the kit as didn't want to spend money on a graphics card and PSU if it proved rubbish. I was happy with the results considering the best you can get with the express card slot on the X220 is 2x PCIE with Optimus compressing information!
3DMark06 results before with internal Intel HD3000 card = 4900 points
I borrowed my mates GTX550 1GB card and the results were as below:
3DMark06 = 16500 (http://www.3dmark.com/3dm06/16976847)
3DMark11 = 2600 (http://www.3dmark.com/3dm11/4893226)
Didn't need an external monitor as it all displayed on the laptop's monitor Was happily gaming away in full detail on a Lenovo Thinkpad with higher 3DMark scores than the new Alienware M14x!
It's a bit redneck doing it this way, but a lot more fun. Means I have a nice sensible ultraportable laptop for using at work and a gaming beast when I get home and plug it in!
That's fantastic! So all i'd need is a graphics card, PSu and that cable, to get it running on any ultrabook?