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Network connectivity is provided by one Realtek RTL8111B via PCIe. An VIA VT6308P provides two ports of FireWire 400. MSI uses a standard Realtek audio codec, this time the ALC888T which has special support for VOIP, but only with revision 1.0 which was not on any shelves. With Revision 1.1 MSI dumped the VOIP support and selected the more cheaper ALC888, we guess that saves a buck or two.
Revision 1.0 (sorry, bad picture :)