The prices for the GeForce GTX 780 and GeForce GTX 770 have dropped to $499 and $329.
This may be planning in late November and the main reason is to compete with AMD.
Also AMD's announcement of its next-generation Radeon R7 and R9 graphics cards.
NVIDIA come today with ShadowPlay available in GeForce Experience and update for Console Mode, Gamepad Mapper.