Now you are just being ridiculous, an Nvidia Tesla K40 outperforms a GTX 770 at gaming so the GTX 770 is not made for gaming and the Tesla K40 is??? Yeah right. No GPU can ever be future proof because technology and graphics are updated constantly, and link with each other hand in hand. 3GB of RAM is fine as hexus.net
done a review of the card and it performed just fine at 4K, you only need 6GB if you are using multiple monitors. Lastly, you obviously have no idea what you are talking about, because 2 cards would 'equate' to 6GB of VRAM. But only 3GB could be utilitised because VRAM does not stack on the current kepler architecture.