Just so you (who ever reads this) know:
I have my OPI+ running at 100% all the time (gov: performance). Installed a fan. Fan did not cool the cpu much. Installed 3 little heatsinks. Max temp dropped 25 degrees celsius (with the fan blowing of course). (at 100% load / performace the cpu-temp = 50 degrees celsius, in my case)
I am just fooling around with the OPI+ and armbian. Still looking for a "better" OS. (hope DietPi will get a dev sample board and will make an image for the Orange Pi+)