Block still looks like new. Top metal backplate will tend to show discolored (greasy looking) areas as the thermal pads do their magic.
Nothing to worry about (anyone who has owned these knows what I mean). Card under full load never exceeded 44c. Card was installed in a system that only ran when in-use, which was never so there is a Super amount of life left to this card given proper cooling and loop maintenance. YOU MUST HAVE A CUSTOM LOOP FOR THIS CARD, AS IT DOES NOT HAVE FANS AND REQUIRES WATER/LIQUID COOLING.