Aesthetically, both cards are identical, save for the shoddy engravings of their names. Based on the leaked pictures, both cards seem to share the same NVTTM cooler found on the GTX Titan. But that is where the similarities end.
While the GTX 780 is said to be a GK110-based part (known internally as Titan LE), the GTX 770 is rumored to be a slightly higher-clocked variant of the GTX 680 that will be based on the GK104-425 core just like the archetype.
According to reports, the GTX 780 will cost somewhere between $699 and $759 and feature a GK110 core with 2496 CUDA cores, 208 TMUs, 40 ROPs, 5GB GDDR5 memory and 384/320-bit memory interface. The GTX 770 is expected to cost around $400 and pack a GK104-425 core with 1536 CUDA cores, 128 TMUs, 32 ROPs, 2GB GDDR5 memory and 256-bit memory interface.