Next-gen of 3D acceleration
One big effect of geometry acceleration is the difference (or lack of difference) on lower-end PCs. Potentially, if you've got a P2-266 and a P3-500 side by side, the graphics portion of games such as Quake 2 and Unreal will run at near exactly the same speeds on each of the systems. Unreal might lag slightly due to more sophisticated AI, but you'll no longer need to worry about upgrading the CPU to get more FPS. Yep, this is probably Intel's nightmare as the CPU becomes a non-factor in the specifics of 3D performance