While those temps are pretty hot, they are not killer temperatures (for graphics cards). Temperatures above 80c might cause some problems such as artifacts, but in many cases a graphics card could continue on to temperatures above that. It would not hurt to try and dissipate some of that heat.
Adding some air flow might just do the trick, as the vRAM might be running a little hot. If not, you might try updating to the latest drivers and see if that helps at all.
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