Wanting to get a budget motherboard that has some performance to it.
Comparing the nForce 560 single gpu to the nForce 570 SLI

The 560 says it has a total of 19 PCI Express lanes. And the 570 SLI say it has a total of 28 PCI Express lanes. I`m assuming it is meaning if you are using 2 gpx cards? I will only be running 1 card and want to know if I get more pci-e lanes with the 570 SLI board still using only 1 card.
I`m moving from my nForce4 SLI x16 chipset because the board went bad.
Is the nForce 500 series a step down from the nForce4 SLIx 16?