14 DAY TRIAL // The stocks of 7950 GX2 cards are falling rapidly as the G80 is getting closer. Also, the price has fallen in the last days and you can buy one of these for about $500. According to The Inquirer, you can still find these cards on the market but they are not that widely available as they are good sellers. The prediction is that the 7950 GX2 species will become extinct and make room for a better adapted race, the G80.
This model is said to give the most frames/money for a single card. Almost 2 years have passed since nVidia first introduced SLI, redesigning the idea of 2 graphics cards working in parallel to double the performance (3dfx was responsible for that one - two PCI cards draw alternate lines in "scan line interleave mode"). As PCIe graphics started to advance, nVidia introduced its own SLI as well as nForce 4 motherboard chipsets that supported 2 graphics card slots.
ATI joined the game later with Crossfire, and that had some consequences, as nVidia is always one step ahead. Whether it's cheaper SLI motherboards, cheaper SLI-capable graphics cards, or drivers that enable new features in SLI mode, nVidia manages to stay in front of the race. One of their best tricks - as Extremetech reveals - is the SLI on a single graphics card, as the 7950 GX2 is a union of 2 7900 GT GPUs, with 2 circuit boards, into a single (but double-wide) card. It's one unit, but has 2 printed circuit boards (PCBs), each with a G71 processor, 24 pixel-shader units and texture-address units, 8 vertex-shader units and 16 raster operators.