Nvidia plans to refresh its graphics processor unit (GPU) line with two graphics cards -- the GeForce GTX 280 (D10U-30) and the GeForce GTX 260 (D10U-20) expected to debut June 18.

The upcoming GeForce GTX variants will differ mainly in terms of number of shaders and memory bus width. Also on the GTX 260, 48 stream processors will stand disabled besides the GTX 260 shipping with a 512-bit memory bus capable of supporting 1GB GDDR3 memory and a 448-bit bus capable of supporting 896MB.Like Nvidia's GeForce 9800GTX, GTX 280 and GTX 260 will add PCIe 2.0, OpenGL 2.1, SLI, and PureVideoHD. The two new graphics cards will also support two SLI-risers for three-way SLI support, according to Nvidia.

While the GTX 280 will enable all features of the D10U processor, the GTX 260 will have a greatly sized-down version of the same GPU. The D10U-30 will have all 240 unified stream processors designed into the processor.