A lot of prospective buyers of new generation GPUs were counting on the US $499 launch price of NVIDIA GeForce GTX 680 to result in reactionary price-cuts in the red camp, particularly with the $549 Radeon HD 7970. NVIDIA's GPU is faster, more efficient, and under normal circumstances, should leave AMD with no other option, but to cut prices of HD 7970 to stay competitive. However, that hasn't happened, and according to a HardwareCanucks report, will not happen any time soon.
NVIDIA's GeForce GTX 680 launch wasn't just on paper, there was market-availability on launch-day, although like every other new GPU launch, stocks have been quite limited. Before this launch, AMD and its partners managed to replenish inventories of Radeon HD 7970, making it generally available, while not budging from its ~$549 price. Sources told HardwareCanucks and this situation won't change unless NVIDIA has a more full-fledged lineup of new-generation GPUs against AMD's, or unless the availability of GeForce GTX 680 drastically improves.