A million more than 2400 parts
ATI's new 55 nanometre RV620 chip branded as Radeon 3450 / 3470 will both end up with 181 million transistors. This is just one million more than the 65nm RV615 chip.
This additional million brings PCIe 2.0 support and DirectX 10.1 support. At the same time, the 55 nanometer process enables it such that ATI can go to 700MHz and still have good thermals.
Radeon 3470 is supposed to compete with Geforce 8500 GT, while the 3450 will attack the Geforce 8400 GS products. It gives Nvidia some fearsome competition, and has superior video performance, especially in VC1 decoding.