In terms of physical characteristics, the GTX 760 looks exactly same as the GTX 670 or GTX 660. However, under the hood, it is running GK104-225 chip which is a slightly cut down version of the GK104-325 used in the GTX 770. A picture also reveals some basic specifications of the new graphics card. It has 2GB of GDDR5 memory running on a 256-bit wide memory interface. Furthermore, it has two 6-pin PCIe connectors for power.
English Source: Chiploco
Chinese Source: EXPreview