I did a quick search on here and I didn't find any documentation on this. I found there are three different kinds of heatsinks for these. Two are silver in color (aluminum?) and one is copper. I have a FW800, that was originally a dual 1.25. It has one of the silver ones. I installed a DP 1.42 card in it, but used the same heatsink. Should I find a copper one and install it? If anyone has documentation on the differences between all three that would be great.