Of course they're cheap for a reason. I was just a little bit interested in the technical details of what causes a display like this to fail.
And yes, these monitors are dual-link dvi only.
Just to be clear: the 5750 is supposed to be dual-link capable, but the ebay sellers for these monitors all seem to state that they don't work with the 5750 (nor a bunch of other ATI & NVidia graphics cards of similar vintage).
Also, they don't work with some video cards (I know my Radeon 5750 has occasional trouble syncing with my HP LP2475W for some reason, but that's single-link DVI only. I imagine these monitors are dual-link DVI displays?)