We can confirm that Quad SLI works in normal Nforce 4 motherboards. So far as we are aware, it will work with Asus A8N32 Nforce 4 SLI X16 chipset. You simply plug two cards in two by sixteen slots and the other two are connected anyway.
We know that the cards will even work on the EVGA Nforce 4 micro ATX board that uses Nforce4 SLI chipset and has just two by eight PCIe slots. It is apparently enough, as all the cards are interconnected by a bunch of cables.
There is a big chance that Quad SLI will work in your Nforce 4 SLI motherboard as well, but be prepared to give up some serious money for four graphic cards.
Izvor: Inquirer