There are a few combinations between the north and south bridges, which will hybridize to give you various motherboard options. There are, as of now, two north bridges (the graphics processing engines ? 6100 and 6150) and two south bridges (410 and 430). By integrating the aforementioned combinations, NVIDIA plans to deliver the following solutions: 6150/430, 6100/430 and 6100/400. The 6100/400 is the entry-level arrangement with limited features and additional lack of PureVideo, Gigabit Ethernet, and two PATA connections as opposed to four for the other two. NVIDIA has, however, added HD Azalia Audio support.