Intel i925X & i915P/G Chipsets
 

The most disappointing aspect about these chipsets has to be the performance of the i925X chipset versus the i915P/G. Intel claims performance enhancements for the i925X over i915P/G such as an advanced memory controller that is capable of offering more bandwidth. They come through with that fact, but in the end that isn’t enough to make the i925X a viable buy over the i915P/G chipset in our eyes. Until we start seeing some better gains from i925X motherboards, they’re going to be hard to recommend over the certainly cheaper i915P/G motherboards

http://www.mbreview.com/i9xxchips.php