I'd imagine the pixel clock speed of cards like the cv64, PIV, CV64/3d and CVPPC can drive higher res screens.
i'm running 800x600x24@60hz on my vampire, and can probably push it to 1280x720, but to run "fullHD" 1920x1080, i would need to drop the freq to 24hz. something i probably wouldn't have to do with a "proper" card. and something i just can't be bothered to muck about with.
the vampire's "graphics memory" is a software assignable lump of shared space out the 128meg available on the Vampire - and the clock is based on the speed of the FPGA.
having said that, the vampire's 800x600 screen feels nice and smooth. smooth icon scrolling, smooth window movement. its just a nice place to be. no figuring out switching superlayers, or supergels on or off, or smart/simple window drawing. it just does it.
the CVPPC can ramp up to 230mhz@8bit on the pixel clock, and has 800Mb/s to its local ram. about twice the vampire's clock, and about 5 times the ~150-160Mb/s ram bandwidth that the Vampire has.
not to mention hardware blitter, and other stuff built in, or sharing the ram bandwith with cpu fastram operations.
i did find find the maximum assignable bitmap area on a Permedia2 chip is 2000x2000. annoying when trying to run a three screen setup via a Matrox Triple-head-to-go box. was amusing seeing a guru meditation error spread over three screens
anyway, just my experience.
640x480x24@60=52.734375 Mb/s
800x600x24@60=82.39746094 Mb/s
1280x720x24@60=158.203125 Mb/s
1920x1080x24@24=142.3828125 Mb/s
