My pc is dropping frames

[gaming guido]

HI!

I am gaming guido and i love gaming and for gaming purpose i have bought a budget pc its dell optilex 9020 i7 4th generation with 16 gigs of ram 4 gb nvidia inno 3d gtx 1050ti.

I haven't changed the power supply cause the person from whom i bought it said " inno 3d doesn't need the power supply".

I have been playing on it for 5 to 6 months maybe.

I usually play fortnite on low settings and 60 fps(because i play for long time in it so i don't play above 60 fps)2 days ago i played on in it for 6 hrs constantly ,but when  i played on it again yesterday the frames were dropping to 20,10 like it was lagging and kind of stucking and have restarted the pc but i dind't work.
is the pc is overheating?do i need to change the cooler?

Can anyone tell me what has happened and how i can fix it.

[Uptivuptiz]

Download and open HWInfo and play a game for about half an hour. Then Alt-Tab out and see what the temps are. Also if you start lagging instantly when opening the game the issue is not thermals.

[gaming guido]

OKAY thanks i will try that.

What should the temperatures be.

[Uptivuptiz]

3 minutes ago, gaming guido said:

OKAY thanks i will try that.

What should the temperatures be.

Anything below 90 C is good enough, however the optimal temperature is 80 and below  

[gaming guido]

4 minutes ago, Uptivuptiz said:

Anything below 90 C is good enough, however the optimal temperature is 80 and below  

last time when i checked the processor temp was around 60+ or -

 and the gpu temp was 30 + or -

in C

[gaming guido]

and i forgot.

My pc has some dust

SO does the dust causing this thing?

[Uptivuptiz]

1 minute ago, gaming guido said:

and i forgot.

My pc has some dust

SO does the dust causing this thing?

Just be safe, clean the dust out and try again.

[gaming guido]

thankyou!