The main areas this should help near term are HyperMemory/TurboCache cards , those that use VirtualizedMemory (need WDDM support first though through DX10.1), and workstation cards which use large chunks of system and VRAM.
For most gaming situations you shouldn't see massive improvement in the current round of top gaming card because they're not as restricted by bus speed because the swaps don't happen as much as the information spend in the VRAM and in the VPU itself.
You might see a jump in the GTS-320 in some situations where it runs out of VRAM, but even then the improvement will be limited.
However you won't know until they're properly tested, while bandwidth doesn't seem to be an issue, improved latency could help alot of areas and we could se a small jump across the board, especially in min fps and texxture swaps. Heck, no one thought we used more than 8X bandwidth until they tested it and noticed that ther are a few occasions where it does make a difference. So since we couldn't test beyond the 8x->16X boost who knows, eh?
