Hello,

70 is still safe, but of course you want it to be cooler. When it overheats, it can also freeze your 3D game after playing a few minutes. I blamed it on (a) software bug(s) when it happened to me, but it turned out that the GPU hit 90 degrees Celsius and more.

Installing a new cooler didn't turn out to be that difficult. Hardest for me was to remove the push pins that attached the old cooler. It never passed 65 degrees after (6600 is a hot chip) and ran quieter for ~$20.