As far as i know, i think 970 series motherboard cannot handle FX9590 as the VRM's cannot handle it, they will overheat and toast themselves can you link the motherboard from manufacturers site? (Exact model)
What is your PSU?
I hope it was cheap as even a low end modern cpu beats the old FX9xxx across the board. The h100i isn’t the best for that inferno of a cpu. You will probably need to rig up extra cooling for the motherboard VRM’s and what psu do you have, AMD recommend 850+ Watts for the FX9xxx series.
But i agree, FX 9000 series are nuclear reactors. If that motherboard doesnt have VRM coolers, either buy off an ebay VRM heatsinks with coppper and stick them, that should help as airflow.
If you decide that you bought an hassle there are choices like i5-4th gen (which i recommend most of people) should handle better than FX. Im not saying that FX is crap but it can still handle games like PUBG and others (CS:GO GTA 5) without issue.
Well its outdated. (Bulldozer->Piledriver->Vishera)