The vram is easy a toddler can do it but the VRM is of concern. You can try to uses several vram heatsinks but that is no guaranty that it will work. The best option requires skill and the materials needed if no ready made heatsink is available. You see those mosfets to the rear of the card that is what you need to worry about. Your situation is better than that of the 4870 and the 4890 owners who are moving to a better cooling solution.