Hab's schon gefunden :
Dual Board Installation for Scan Line Interleave(SLI)
1. Shutdown the system and turn off the PC
2. Open the PC and locate 2 free PCI slots next to each other
3. Remove cover for both slots from the computer chasis
4. Connect the SLI connector to both boards.
5. Place the VGA Monitor cable into the Voodoo2 Card near the M/B power supply.
6. Plug the pass-thru cable from the voodoo2 card (which monitor cable is plugged in) into the 2D card.
So hab alles abgeschrieben was im Handbuch steht.
Ad 1-3. ist natürlich alles logisch.
Schleifen muss man also 1x es steht nirgends 2x drin.