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What resolution are you running the game graphics at? I'm wondering if any graphics card can keep up at that resolution.
I didn't use the T221 for gaming - well, not much anyway. Here I was getting around 3 fps with everything maxed. Normally I used my Sony GDA-FW900 at 1920x1200, which as of today is still the best gaming monitor... I got around 28 fps at that resolution using my ATI 5770, some setting on max, some on medium/high. When I wanted a better frame rate, 1280x800 was pretty good at around 60 fps.
The only game I really played with the T221 was Medieval II: Total War. It looks so much better with all the tiny soldiers it's crazy - and it's old enough (and the type of game where sub-30 fps is tolerable) that it runs decently. I also tried a little HL2, but the input lag is too much to be very fun to play. It does look sweet, of course.
I ran it using the 5770 with Eyefinity. It can take up to four DVI inputs at once, but I was limited to two because of the card. The frame rate is the main drawback - at best I could get 35 Hz when using both links and using a custom overclocked EDID. The monitor itself (mine is the DG3 model) always refreshes internally at 41 Hz (the more powerful DG5 model does 48 Hz and can use a dual-link DVI plus a single-link DVI cable to get there) regardless of the input frame rate. There is extensive on-board processing that handles all of the resizing, division of the panel based on input, etc. - that's what causes the lag. Of course, the refresh rate isn't too hot either - but it was intended for mostly static images, of course.
For extra speed, you can bump it down to 1920x1200, where it still looks better than any other monitor thanks to the tiny space between the pixels compared to normal monitors.
Basically, running one of these is not for the faint of heart. It takes specific hardware and a bit of work to get them running right.
I think the top dual-GPU single slot cards would still be brought to their knees with the T221 by Crysis at max - although if ATI has got Eyefinity working with Crossfire, it may be a different story. NVIDIA really isn't relevant for the T221 since you need Eyefinity to do spanning.