set fan control in precision to 85% and you will be fine, temps are your issue.
I run my vanilla cards at SC speeds with 85% fan no problems and rarely goes over 65c.
At 96% Load and Fan maxed out at 85% speed it sits at 98C.
I have a nice case... I have a front fan that blows the air directly at both video cards from the fron as well as this huge fan that blows at them a bit from a side.
The only thing that I can think of is that the cards are sitting next to each other. Then the front fan might not be strong enough.
Hmmm... running at 98C all the time is gonna fry my damn motherboard LoL
What should I do?! Probably work on getting some front trubo fan for more direct air flow?