I'm in the market to swap out some old dual card graphics hardware for something slightly more up to date on my workstation. I'm thinking about getting a single card with 2x DMS-59 ports (support for 4 monitors with DVI splitter) . But I'm unsure how X would handle this configuration.

Ideally I'd like to be able to use compositing and other desktop effects as i've lived without them for some time and they're just... pretty (besides transparency would be a huge boon in my day to day tasks)

Has anybody got any experience with running 3 or 4 monitors off a dual DMS-59 head video card that would care to comment on how X handles it by comparison to running 3-4 monitors across multiple distinct cards?

I've been completely unsuccessful at finding any sort of information about this in the couple weeks I've been researching it.