I use a file to grind about 3-4 mm off a corner of the heatsink then applied K5-pro and MX-4 thermal paste. I have the 2-pipes heatsink and the card almost fitted perfectly but I had to grind a small part of the heatsink. The first thing I did obviously is opening up the 27" iMac 11,1 and replaced the faulty card.
I would like to share my experience replacing it if I can help the community. This time I replaced the 4850 with an AMD M6100 2GB from Dell. I also have a 2011 iMac with it's original GPU, a 2GB 6970M that is still working fine but I know, it will fail eventually. It is my second time replacing a failing GPU in an iMac.
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