Nvidia has another GTX 1060 GPU with 5GB of GDDR5 memory
 

Could be only for China market

It appears that Nvidia will be launching yet another version of the GTX 1060 graphics card which could pack 5GB of GDDR5 memory on a 160-bit memory interface but the same amount of CUDA cores as the GTX 1060 with 6GB of memory.

Rumored by the Chinese Expreview.com site and spotted by Videocardz.com, the report suggest that Nvidia might release a fourth version of the GP106 GPU, the GP106-350, which could end up with 1280 CUDA cores, same amount as the GP106-400/410 based GTX 1060 with 6GB of GDDR5 memory, but pack 5GB of GDDR5 memory on a 160-bit memory interface.

Bear in mind that Nvidia already has three GP106 GPUs, which includes the GP106-300 which has 1152 CUDA cores and comes with 3GB of GDDR5 memory on a 192-bit memory interface, so the latest one could fill the gap in the lineup.
http://fudzilla.com/news/graphics/45...f-gddr5-memory