NForce4 SLI: Wise Upgrade Path?

For those who want the best visual game playing experience possible, SLI motherboards do offer the best and broadest options for all current platforms, but these mobos are also being marketed as the best upgrade-path option. The argument is, buy an SLI-capable motherboard and you can then spend less up-front on your graphics card. Later, a second graphics card can be used to bring graphics - namely gaming - up to snuff with high-end gaming systems. The argument looks good on paper, but the facts suggest otherwise. We will explore the idea of upgradeability and examine why SLI falls short of being the best option for upgrade-conscious buyers.