NVIDIA GeForce GTX 780 Ti Review @ OCC
 

In my testing, a boost clock speed of 1291MHz was reached with a memory speed of 1940MHz for a stunning improvement in 3DMark scoring. The baseline clock speeds for the GTX 780 Ti are 875MHz on the core with a typical GPU Boost 2.0 frequency of around 928MHz over a wide array of games. During my testing, I never saw speeds drop below the 928MHz threshold. A much different strategy than what we recently saw with the R9 290X, which when run in Quiet Mode would shed clock speed as fast as donuts disappearing at the morning roll call at your local police department. No such troubles here. Both manufacturers use dynamic clock speeds, but it's how well it's implemented that makes the difference once the cards heat up during gaming. This is where we see another point of difference. The vapor chamber cooling solution used by NVIDIA for its GTX 700 Series Kepler cores has been rock solid in terms of cooling efficiency and the low noise profile it uses thanks to the improved fan algorithms implemented over successive launches.

http://www.overclockersclub.com/revi...idia_gtx780ti/