All XBox 360 versions, including the Slim, come with a 10/100MB Network Card.
The Microsoft XBox 360 motherboard has had several version changes, just like all long life electronics, usually as a result of manufacturing improvements designed to save money.
XBox 360 Motherboard Hardware Revisions (from the good people at WikiPedia)
|Codename||CPU||GPU||HDMI||Power Supply||In Production||Date Released||Notes|
|Xenon||90 nm||90 nm||No||203 W||No||November 2005||Original release.|
|Zephyr||90 nm||90 nm||Yes||203 W||No||July 2007||Introduced HDMI port|
|Falcon||65 nm||90 nm||Yes||175 W||No||Late September 2007||Introduced 65 nm CPU. Power consumption lowered.|
|Opus||65 nm||90 nm||No||175 W||No||June 2008||Available as a replacement for Xenon motherboards which have been sent in to Microsoft repair centers.|
|Jasper||65 nm||65 nm||Yes||150 W||No||September 2008||Introduced 65 nm GPU. Introduced on-board flash based memory. Further reduced power consumption.|
|Trinity (Valhalla)||45 nm (combined “Vejle” chip)||Yes||135 W||Yes||May 2010||Motherboard redesign used in the Xbox 360 S (not used in other console versions). Two versions; one with 4 GB on-board storage, one without.|
|Corona||45 nm (combined chip)||Yes||115 W||Yes||August, 2011||No more HANA Chip; integrated into southbridge. PSU is 9.86A, down from 10.83A – Cannot use Reset Glitch Hack (relied on HANA for timing).|