What is the most important parts of the video card in Bitcoin mining? For example, obviously it doesn't matter what type of adapters a video card offers when it comes to Bitcoin mining? Is the GPU speed or the amount of RAM the most important part in terms of megahashes per second?
SHA256 does not require much, but if you intend to use it for scrypt mining too, it's said that memory is most important, i.e. speed and size.