Userbench is saying your cpu isnt performing well. An avg turbo of 2.3GHz. 9400F has a base clock of 2.9 and 3.9 all core turbo. Looks like your cpu is not being cooled properly and is throttling.
A30 is a mediocre cooler and needs a lot of air flow for it to be any good. Your case only having one rear fan wouldn't be helping. Your case can accommodate 2x 120m or 140m intake fans. They didn't include these because the case is designed around the idea of having a water cooled radiator with fans placed at the front instead.
Check idle cpu temps with HWinfo64 or Coretemp. If cpu is overheating, i suggest checking your cooler is mounted properly and getting intake fans for your case.