At some point I am going to buy a 2nd 1 GB 7850 for my son. What is the most you would think I should pay new or used for one ? Also can I not pair a 2 GB 7850 with a 1 GB 7850 and it will just use the 1 GB but will run in Crossfire properly ? Would that be correct ? The reason I thought of doing this is maybe in the future I would want to give the 1 GB 7850 to someone and then eventually pick up a 2 GB 7850 on the cheap and so he would have 2 cards that would be using 2 GB vram.