One of my cards was running hot so I took it apart to see what was going on and discovered a crater maybe 2mm wide and maybe 50-100 microns deep in both the heatsink and the GPU. It's like some tiny people let off a tiny stick of dynamite and made this not-so-tiny crater.
Card works totally fine except for getting hot. How to fix? Sandpaper?
photo would help.
i would not sand the gpu chip.
maybe the heatsink can be buffed flat and load the groove on the gpu chip with extra heat sink paste.