Low fps with this system

[lMars_]

Hello, can someone help me? For the past 2 weeks I've been having fps issue with this system.  The system is a mix and match of old parts from my brother's pc

 

PC Spec

CPU: Core i5-6600 (used)

GPU: ZOTAC GTX 1060 3GB (used)

MOBO: Biostar H110Mhv3 (used)

RAM: 12GB DDR3 1600MHZ (8gb+4gb lol) (Dual Channel) (New)

PSU: CM  MasterWatt Lite 600W (New)

 

The monitor that I used is a LG with a resolution of 1440x900 (used a vga to dvi adapter to connect the monitor lol) .

 

(The screenshot was taken from a bot match)

When playing dota2 in intensive part, the gpu usage is around 25% to 35% at 1596MHZ core clock, while the cpu clocked at 3.5GHZ at 80% to 95% usage with 44fps.

The setting that i use

While at the menu, the gpu usage is higher at 55% to 75% usage at 1569MHZ core clock, while the cpu is at 40% to 50% usage and clocked at 3.7GHZ with 100+fps.

Can someone explain and come up with a solution, or is the gpu is beyond repairable?

Thank you.

Things that i've tried so far (but the problem still occurs):

• Trying to play with a stick of ram
• Change the setting across all setting (low to high)
• reinstalling nvidia drivers

Note:   

• I tried running various api (dx9, dx11, vulkan, and opengl) but the result is still the same. i'm also using the latest nvidia drivers and on the latest mobo bios.
• The weird part is, in some games eg Titanfall 2 played at the recommended setting can easily reach 80+fps, apex legends played at mix of medium and high around 70+fps (a bit stuttering) with a gpu usage above 50%+.

 

[Chris Pratt]

You're CPU bottlenecked, especially at such a low resolution.

[lMars_]

14 minutes ago, Chris Pratt said:

You're CPU bottlenecked, especially at such a low resolution.

So, i just need to play at 1080p resolution and should see a high fps then? Thanks for the reply.