NVIDIA's current flagship GPU is the GT200. It is used on the GeForce GTX 260 and GeForce GTX 280. Only recently NVIDIA has added a third card design to that lineup. The GeForce GTX 260 216 Shaders still uses the GTX 260 naming, but comes with an increased shader count of 216 shaders. Leadtek has decided to call their product "GeForce GTX 260 Extreme+". The Extreme probably stands for the 216 Shaders, while the + stands for an overclock out of the box. As I mentioned in our first GTX 260 216 review I find NVIDIA's naming scheme a bit confusing. Something like GeForce GTX 270 or 265 would have made more sense to facilitate the buying process for less experienced users.
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Review: techpowerUp