I don't think many people are left using the nforce lans because of this problem and to my knowledge there is still no real solution.
As for sound it might be easier to get a supported usb device.
Lastly graphics I would start by checking that your device id is in the appropriate kext files.
nvinject
geforce.kext
Nvdanv50hal.kext for 8 series
nvdanv40hal.kext for 7 series
nvdaresman.kext

In all you need to look for a line like this in the .plist file

<key>IOPCIPrimaryMatch</key>
<string>0x029210de</string>

and insert your device id 0x"your id here"10de