Intel Core I5-9600k+GTX 1070 underperforming

[unknown011226]

I was recently able to upgrade my pc to have an intel core i5 9600k. It's paired with a GTX 1070 and new 16 gigs of ram. However, I'm not getting full performance. I'm getting a low of 40 fps in GTA , a low of 50 fps in Skyrim SE and in cinebench scored no more than 950. I feel like my previous CPU performed better. I have already updated my drivers, reinstalled windows.

 

[norcalsc]

upgrade from what? complete system specs please

 

[unknown011226]

I upgraded from an i3 8100 (yes, it's a fairly new processor but I still upgraded).

My current specs are:
CPU: Intel core i5 9600k
GPU: Gigabyte G1 GTX 1070
Ram: G.SKILL Ripjaws V Series 16GB (2 x 8GB)
Motherboard: GIGABYTE B360M DS3H (Updated BIOS)
PSU: Corsair CX600m
1 SSD
2 HDD