1.S,
91 deg C is a might hotter than what I would dare to set for 24/7 crunching. Everything I have read on video card OC suggested a Max of 85 deg C except for short benching run. I personally use a max of 70 deg C for 24/7 GPU crunching. I now run 2 Gigabyte R7950 WF3/OC in Xfire in one rig. They ru @ 1200 core and 1.288V VDDC. Temp for top video card range from 58 to 62 deg C. Ambient room temp presently 19 to 21 deg C. Fans are set at a fix 78% setting for both video cards.
Suggest that you try to add a side exhaust fan above video card to remove hot air being generated by video card and insure that you have an unrestricted cool air intake airflow into the case. This extra side fan, above the video card, reduced the top video card temp by 10 to 12 deg C for my crunching rig.




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