some dual graphic cards use openGL in just one DVI port, which are those?

hello

i need to play 9 (4 minutes, 300mb each movie) different movies at 720x480 synced
:s

i'll use two computers
one using three dual DVI's graphic cards to display 5 images
and other with 2 graphic cards displaying 4 (synced by ethernet)

so today i test it with this setup

3 asus pcie 3850 ATI, latest catalist 8 drivers
processor, intel core 2, quad q6600 at 2.40 ghz
ram, 2 gb, 2.40ghz, (with the videos loaded there)
motherboard, asus p5q-e
SO, windows ue sp2
Max 5.0.4

the setup was really easy, an versatile, i easily got 5 different outputs at one large desktop.

however in the max patch i got the message
jit.window invalid enumeration

i tried just a jit.qt.movie connected to a jit.window (using hardware descompression)
and the same story, (the movie stop working), but this happens only when i put the jit.window window in the secondary screen,

so i investigate and found (from the GEM pd guy) that
some dual graphic cards only support open GL for just one dvi

mmmm, i look at the specs of the adapter and i didn't found any
specification on this

(i saw in the forum that ati works better for direct x and that nvidia is better for open gl)

so.. where i can see if a graphic card supports open gl for both dvi's?, which cards should i look?

in the meantime, i got
ONE zotac pcie 8600 gt sli NVIDIA graphic card,
i put it in the same setup
using two monitors, i arrange 5 movies at 720x480 (yuv)
in one jit.window using videoplane at large of both desktops

everything works very smooth in both screens ;)

so it looks is the graphic card

i'll try tomorrow adding graphic cards of this same model
(in a compatible motherboard) to see if i can get multiple desktop and if i can get rid of the invalid enumeration problem

any advice of which data or graphic card should i look to have multiple desktops with multiples (short) movies (performed by the GPU), will be appreciated

Thanks