new system graphic card question

[dragon]

I am building a new pc and when it comes to the graphic card I have a couple of options. My two options were dual GTX 780 6gb acx cooler or a single GTX titan black superclocked signature. The Titan black has
NVIDIA GTX TITAN BLACK
2880 CUDA Cores
967 MHz Base Clock
1072 MHz Boost Clock
Memory
6144 MB, 384 bit GDDR5
7000 MHz (effective)
336 GB/s Memory Bandwidth

The GTX 780 has
2304 CUDA Cores
863 MHz Base Clock
902 MHz Boost Clock
165.6GT/s Texture Fill Rate
Memory
6144 MB, 384 bit GDDR5
6008 MHz (effective)
288.38 GB/s Memory Bandwidth

By themselves the Titan is lot better than the 780 but I am not sure how dual 780 would compare. Do anyone have any idea

[Mr Bean]

First off I'm jealous
Second Tom's Hardware GPU charts are a handy method of comparing cards across several applications.
http://www.tomshardware.com/charts/

However Titant VS two 780 SLI there is no contest. The Geforce 680's in SLI mode which are a good deal less well off than the Titan stomped it by 20%-40% performance, the 780's will give you a 50% performance bump over a single Titan.