shrapnel_indie,
All of the false. I'm not sure where you got that information or think that to be true.
From Nvidia's own SLI marketing page:
"Upgrade your rig with a second NVIDIA GeForce GTX GPU to enable SLI, the system turbocharger of choice for gamers, which enables everyone’s favorite titles to be played at the highest screen resolutions with every setting maxed out. NVIDIA SLI supports the use of up to 4 GPUs, and thanks to FCAT, SLI is certified by independent press as fast, smooth and responsive."
You just need a motherboard that supports it. Nvidia requires that all cards have the same bus speed (16x/16x or 8x/8x, 8x/8x/8x, or 8x/8x/8x/8x) in order to SLI. That's the only "cap" they have.