That was everything I needed to know. Thank you VERY much MultiMac!

So now that I know I can get away with 1 x 8800, lets ask some more questions. What is the effect of increasing the gfx settings on your 4 slaves with and without the second card? Can you get away with higher slave settings at higher FPS using a second card or is this also marginally different from 1 card?

What keyboard multiplexer software do you use? I downloaded clonekeys. Is there better?

Assuming you can SLI with the 2 x ATI HD3780 on a windows partition, does this imply that since the hardware can handle it, it is only a matter of time before OS X will support it?

You have already given me great info, I am just asking the rest out of curiosity.