looking into getting an xps but want 256 mb video
Originally Posted by stevecc
Guys, PCI-E is simply an interface between, in this case, the GPU and the northbridge. The PCI-E interface has a limit of 75W for power, compared to about 45W for the AGP bus.
As I said, it is only 69% efficient, so it is equivalent to lets say AGP 10x. Furthermore, again like I said, traffic on the bus for graphics is mainly downstream, or put simply textures or data for games that need to be loaded into the frame buffer for processing or rendering. Therefore even the AGP bus now is not fully used (approx 80% of use in worst case). Add to that the increasing frame buffer size for the GPU (128/256MB) and you get the picture...
So to conclude, PCI-E will not bring a significant performance upgrade to the graphics subsystem, it is more of an evolution instead of a revolution.