Haha, one 7950 GX2 runs in SLI between the two cores. That's why you still need a SLI motherboard to run the card. Four 7950 GX2's are impossible, the chipset logic isn't designed for it. Becides, even if it was possible, it would be unpractical. You would be wasting money and power on something you don't need. Unless you're running multiple-monitors or a large 30"+ widescreen, you don't even need Quad SLI. Just forget it if you're planning Quad SLI on a normal 19" monitor. You might as well save the money for a normal SLI setup and a nice monitor instead.