I want to know the GPU requirements for using CUDA with multiple GPUs. I want to use 3 cards. I understand we should disable SLI mode in order to use multiple GPUs with CUDA, but Should they still be connected using a 3-way SLI connector if I want to program using CUDA. And also, should the cards be of the same type ? Please let me know the GPU hardware requirements of using 3 cards with CUDA.