I have the MSI version GT 710 2GD3 LP with the little fan in the heatsink. I run it in an FX-6300 with a CM Hyper T2 with 16GB on the M51BC version of the M5A97 EVO2 MoBo. Opposite of a gaming case, not great airflow, but an overhead PSU I swapped with an EVGA 450BT. it has a 4" 2K RPM fan exhaust fan near the CPU with the T2 cooler pullig air up from the GPU, over the CPU and into the PSU out the back. I have a 3" 4K RPm fan pulling air from the vent in the case side. My GT 710 used to run 60-65C and now if I underclock and slightly undervolt the FX CPU, I can run the GPU at 1250MHz with the RAM +200MHz in afterburner, It stays around 55C. This allows me to play Astroneer at 30-35 FPS on low settings @ 1360 X 768. I can play Just Cause 3 almost at 30 FPS if I set everything to low, kill Vsynch and drp the resolution to basically playstation 1 quality, but it works. Anything more intense than that either heats the card over 60C, which is technically OK, or it lags and makes games unplayable.
At the end of the day, the GT 710 is just barely enough for me, but I sure wish I had taken that $50 and saved another $30-50 for something with better than 2GB DDR3. It's just a small price difference for a huge boost in performance for light games. It seriously looks like playstation 1 graphics, but it is smooth for it. So get a case fan or a PCI slot fan if you're really worried, but anything under 90C is fine as long as it's not running over 85C for hours on end (though I can't remember where I got the 85C from, it's been a while, verify please?).