MSI GTX 970 hits 80C when gaming

Apr 19, 2018
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Hello guys i have had my GTX 970 for almost 4 years and it have been working like a champ but i noticed like 3 months ago that one fan dosent work at all even when i manually help it.

It idles at 35-43C with no fans turned on and when iam gaming with auto fan speed it hits 75-85C after a very low time periode of almost 15 sec Should i be concerned or should i not worry
and iam always looking at the temp when i watch video or game