PolishDrunker thank you for posting the HWiNFO System Summery.
The CPU memory looks good. It's in dual channel mode and running at 3200MHz.
The reason it says 1600MHz instead of 3200MHz is because it's double data rate (DDR) memory, which transfers data twice per clock cycle.
1600MHz x 2 = 3200MHz
It's confusing. The memory is running at 1600MHz but because it transfers data twice per clock cycle it's considered 3200MHz memory.
Try turning the CPU fan speed up to 100% and see if that keeps the CPU speed closer to 4GHz.
You can see CPU speed in Windows Task Manager under CPU performance tab.