Currently i'm not in need for LAN, so i don't have to think about other solutions yet. Funny, since i toggled off "Onboard LAN" for the first time, after rebooting the entry for "OnChip 1934" (Firewire) was gone. It never reapeared afterwards (even with reenabled "OnChip LAN"). So much for bugfree bioses. They don't exist, mind you...
Concerning "VESA compatibility", i allready had that toggled off in the main configuration since that was requiered to enable graphic display in "Open Cubic Player", i.e. Note Dots, Scopes, Spectrum Analyzer... I guess its because my GForce 5600 lacks VESA support. I'm very unhappy with that, it came to my knowledge after buying and installing the card. My previous GF3 came with VESA support including Textmode 132x60 so i figured its common with GForce cards, but nada.
VESA Textmodes and/or general VESA support in DOS environment seems to be very unpopular with Graphiccard manufactors these days. Before you suggest, DOS VESA drivers won't help, i tried allready. Waiting for Scitech (UNIVBE) to support my card in their current new driver platform.
Regards, deus-ex.