Custom built pc is underperforming

[kasterdin]

Cpu: i5 4670k (stock speeds)

Mobo: Asrock H97m PRO4

Ram: Gskill 2x4gb 1600hz, and patriot 1x8gb 1600mhz

Gpu: Asus Strix 1060 6gb

Storage: HP M700 120gb ssd 

Western Digital green 1tb hdd

PSU: Evga 500 B1

OS: Windows 10 Home 64bit

 

So i built my friend a computer not too long ago, and he says his computer has been frame dropping like crazy. He would try to reduce settings to increase fps, but even with lowering the settings, the fps stays low. His computer struggles in games like Maplestory 2, fortnite, black ops 4, overwatch etc...

I ran Unigine heaven at his house, so i dont have the snippet on me, but his avg fps was 52.9 fps on extreme.

I tried putting his computer in high performance mode, used ddu and reinstalled drivers, changed priorities in task manager, but nothing helped....

Anything helps! Thanks for reading

[Cereal5]

Take that 1 8GB stick of RAM out, then run Heaven and some games again and monitor CPU, RAM, and GPU usage (task manager is fine for CPU and RAM, but MSI Afterburner or HWMonitor is better, and more reliable for GPU usage). Also, I'm gonna need more quantifiable data than "low" and "underperforming". Another also, Unigine benchmarks change intensity based on resolution of the monitor (just like any game), so that's needed info too