Re: SD Composite and 720p HD Component clones with 1080p Desktop also = 3 displays
You definitely can't get those 3 different resolutions out of one card. There's a vague chance composite and component SD would come out of the same adaptor.
Two PCIe cards would do it, but you would need to run software that specifically supports multiple outputs on different graphics cards. There isn't really an OS system that allows accelerated 'mirroring'.