So let's jump right to the point. What is the 415-D chipset? The 415-D chipset is the 420-D chipset without the integrated GeForce 2 graphics core. It has the same TwinBank 128-bit memory architecture as the 420-D as well as the DASP and HyperTransport features. But without the integrated graphics core, NVIDIA can now offer the motherboard manufacturers and the end users a lower-cost motherboard.