I ended up finding a vid card small enough to fit in my case (low profile ati 4350) and that draws little power, so i can box 5 on my main pc using keyclone. isboxer's 5xfullscreen rendering seems to be too much for this machine still.

so i can now bring my team to 80 doesn't look like i'll be able to make the switch to isboxer, but at least i have something to work with now. thanks for the above replies!

-cheesepile