AMD XFX 7870 Radeon Heating Problems

[VIPstabcity]

Hello,
As the title says, my graphics card is a bit hot for my liking. I've been searching around and saw that usually over 90 C during game seems high, and my temp is around 85 C plus during gameplay. For example during Arma 3 at Ultra, my temp is around 89 - 92 C. While I know Ultra will task the gpu more, I still think it is too high. I have 3 fans in all in my desktop, one on the card, one on back and a main one that came with my case 2 years ago. The main fan I have is only 80 mm, and when searching for replacements for it everything was 120 mm, too large for my case. I reapplied thermal paste earlier to the main fan and not much changed for it, and cleaning out everything did not help much. I am asking for some advice on what to do. Is there any 80 mm fans that are really good, that will keep my temps down to about a 70 C average? Or do I have to get a new motherboard for any chance on lowering temps? Any help is greatly appreciated, many thanks.
TL DR: My gpu temps are around 90 C and I want them to be at an average of 70 C.

 

[ohiou_grad_2006]

80mm is still a common size. They also make a PCI slot cooling fan. Basically you install it into an empty slot, I'd put it under your graphics card to see if it will help pull some heat away from it and out the case.

http://www.amazon.com/Antec-Cyclone-Blower-Expansion-Cooling/dp/B000051299/ref=sr_1_1?ie=UTF8&qid=1419816764&sr=8-1&keywords=pci+slot+fan

Maybe something like this would help better?

http://www.amazon.com/Titan-Adjustable-Dual-Cooler-TTC-SC07TZ/dp/B0069W28SU/ref=sr_1_4?ie=UTF8&qid=1419816764&sr=8-4&keywords=pci+slot+fan