most servers don't support 3D and if you find one that does it will probably require that the 3D processing was done on a video card.
So 10 copies of wow would have to be processed through the single video card.

I was trying to use a graphics package to create images for a web page but had to abandon the design. the software package I wanted to use required DirectX 9.0+ which requires a relatively new video card and the particular older model of Dell server only had PCI-X slots ( not PCI-E slots ). I found that nobody makes a PCI-X video card. I also had to consider that all of the images for all users would be drawn with the video card GPU. ( The program or web page had worked wonderfully on my development workstation but died when I tried to deploy on a server )