As stated repeatedly, the GeForce GTX 780 and GTX Titan are able to reach their maximum turbo frequency as their GPU does not reach 80 ° C. It reaches this temperature in all games we tested on a test bench, with and without additional cooling (2x Noctua NF-P12) around the map.
If we measure the performance of a traditional way, we would get higher scores and unrepresentative playing conditions in all our tests. We had to take the time to observe in detail the behavior of these cards in each game to make sure we do performance measures in representative conditions.
Here are two examples to recall measured during the initial test of the Titan GTX with Anno 2070 and Battlefield 3 with a rapid test, a temperature-stabilized and the same test as the latter but with two 120mm fans positioned around the map:
Anno 2070: 75 fps -> 63 fps -> 68 fps
Battlefield 3: 115 fps -> 107 fps -> 114 fps
The drop in performance once the temperature reaches cruising can be considerable. An efficient cooling may partially offset this decline, but are there not a contradiction and have to add noise to compensate for a graphics card is trying to remain discreet at all costs? Temperature of 80 ° C covered by Nvidia is relatively low for a GPU and it might have been wise to opt for example 85 ° C and calibrate the fan accordingly.
Here the average frequency we observed in practice for two selected scenarios: