Quote Originally Posted by DilTech View Post
You see, both GPU's have to store the same information, EVEN IF IT'S AFR mode! Why? Because 99% chance says Frames 1,3,5,7,9, and 11 have 90% the same information(textures, shaders, etc) as 2,4,6,8,10, and 12. You see, when you run multiple cards, both cards must have all the information in their individual memory banks, as both cards are likely to be showing the same textures as one another, as well as the same shaders.
This statement is correct regarding STORAGE.

using the memory bandwidth of both cards to perform identical tasks. Seeing as how they can't share the same information from the same set of ram, they're effectively doing the same job twice.
This statement is incorrect regarding PROCESSING. A single card would have to do this job twice over two frames. Two cards do the same thing somewhat in parallel.

As such, it's the same as a single 256bit memory bus, and a single set of 512mb of ram. That's why most stores make sure to specify 256bit x2 and 512mb x2. 2x256bit doesn't equal 512bit.
No it is not the same as a single 256-bit memory bus. It certainly isn't the same as a single 512-bit one either but it's definitely closer.