Legit Reviews writes some evidence popped up online that suggests NVIDIA is preparing to release a GeForce GTX 660 SE. This new card reportedly competes with the Radeon HD 7850, it promises performance between the GeForce GTX 650 Ti and GeForce GTX 660.
The card has 768 CUDA cores, down from 960 on the GeForce GTX 660, and has a core clockspeed of 928MHz (vs 960MHz). The boost clockspeed is also reduced from 1033MHz to 1006MHz, and the memory runs at 5800MHz (vs 6008MHz on the GTX 660).
The memory bus is 192-bit and the card has one 6-pin PCIe power connector and DVI, HDMI and DisplayPort outputs.
A few 3D Mark 11 benchmarks were also run, showing an average performance improvement over the GTX 650 Ti of 20-25%, but slower than the GTX 660 by about 10-15%. This pits the card against the AMD HD 7850 in terms of performance, although the price isn't known, but should be in the range of $179-$199. Launch date is expected to be early Q1 2013.