For almost a year now, NVIDIA has been teasing enthusiasts with their Quad-SLI technology. It was back in January at the Consumer Electronics Show that we got our first glimpse of a Quad-SLI based system, the Dell XP 600 Renegade. That first Quad-SLI implementation consisted of four GeForce 7800 GTX GPUs, each coupled to 512MB of graphics memory, for a grand total of 2GB of frame buffer memory. Although it looked like four separate graphics cards were used to build up those early Quad-SLI systems, it was actually two. Each GeForce 7800 GX2 card as they became known consisted of a main 512MB GeForce 7800 GTX with a secondary daughter-card mounted to one side..



Link: HotHardware