GeForce GTX 780 has 12 SMX x 16 Texture units = 192 GeForce GTX 970 ... 4:1. These modes are effective for AA surfaces, but less so for 1xAA rendering. Therefore, starting in Fermi Nvidia ...

GeForce GTX 970 ... Nvidia's engineers spent a considerable amount of time studying airflow between boards and determined that this region is critical for feeding air directly into the adjacent fan.