Well actually, the FireGL8800 is based on the 8500 GPU, its touted as a "create it and play it" workstation solution. It has full OpenGL and full Directx 8.1 hardware support. It should quite easily blow away a GTS in every way including gaming. However it is not a gaming solution, it is a mid-level workstation graphics card. I work alot with video and 3D animation as well as 2D applications, this would be the first workstation class board I would consider for my everyday rig, right now I just can't justify it.
BTW, my very first graphics addon board was a 8MB FireGL1000 so I could work with 3DSMax 1.0 in my NEW p5 100 rig. Now THAT board was a poor gamer(worked great in Max though)