On the upgrade side, SLI provides some interesting options for the end user - they will have a choice to simply add a second card to increase performance at some time in the future or the traditional route of upgrading to a more powerful video card. The former is pretty compelling as prices tend to drop and adding a second card should be less cost prohibitive than paying for something that is outright more powerful. Something to note however is that the same dataset is loaded onto both cards which means the total amount of memory available is not a simple addition of the onboard memory size. This is something that may be more relevant as we have seen in DOOM 3, the amount of memory available directly affects the texture quality setting that can be used comfortably.



Link: Neoseeker