I say wait a while before going quad SLI. There are probably going to be a lot of bugs and with such new drivers you won't get close to the same performance as you should.
Stick with what you've got for now, there's no real point upgrading.
OK to deal with the drop in frames, do exactly XFreeRollerX suggested. I wouldn't be surprised if it's your CPU that's bottle necking because you have 2 extremely fast and powerful GPUs and I doubt that any CPU wouldn't bottle neck them.
~B~
Stick with what you've got for now, there's no real point upgrading.
OK to deal with the drop in frames, do exactly XFreeRollerX suggested. I wouldn't be surprised if it's your CPU that's bottle necking because you have 2 extremely fast and powerful GPUs and I doubt that any CPU wouldn't bottle neck them.
~B~