Like Bluenoser said, many of those ridiculous drives were on 1 and 12 at the Mercedes where the tee is 100+ feet above the fairway which slants forward where the ball lands anyway. Some of them were at that Greyhawk or Grayrock course which also has 100+ foot elevated tees where players were driving a 300+ yard par 4 with 3-woods.

I just think back to the British open when they recorded each player's clubhead speed and ball speed on selected holes during the broadcast. Sergio was hitting 285 to 300 yard drives and Stricker was behind him by a few yards. That's at sea level and probably slightly colder than optimal temperature.