Don't know whether you have ordered your stuff yet, but for the price you were getting the GFX cards for its not worth it, you could spend your money on one of their Quadro cards, these cards are fully integrated with CUDA and are meant for this kind of work. Of course if you are going to game it is not really worth it, but it would be a much wiser investment on your part if you plan on using this computer for high scale computational stuff.