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Just some wee feedback if anyone plants on doing this. Was super straight forward with no hidden screws or anything, only needed 2 Phillips screwdrivers and that was it. Can't believe how much gunk they put onto the GPU's though, they were covered and so was the PCB! Cleaned it all up, reapplied the paste on GPU's and also the pads on the memory and also blew all the dust out with a hair dryer. Temps have gone down by 5C which isn't much but better than nothing.
The going rate on the MM is £220. However they are quite rare these days. I sold mine on the bay the other week for £350 in 20 mins so there is obviously still demand. Unless you are running at super high res I would advise that you buy a GTX480 and overclock it (this is what I have done). It runs a hell allot better than my 5970 ever did.
Regrading taking the heatsink off, it's very straightforward, simply remove the screws. You may have to use some force to pull the heatsink off for the first time.
the going rate is whatever the seller wants for it...in my case it was £270...any lower and i wouldnt have sold it... i would rather sell it for a bit lower on the MM than line ebays pocket with there crazy fees plus i would rather a fellow enthusiast got it