Game lags after clean installing windows

Nov 13, 2018
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Hi,
I have ordered my pc 2 months ago and it was working perfect until i clean installed windows 10 1803. Now i have frame drops and freezes in games; for example i was playing forza horizon 3 on 60fps lock(on high) and had some very rare lags but after chaning my windows it runs on 60fps(again on high) but it mostly turns down into 40-45 and some freezes for 1 second.

I did everything!
installed several versions of nvidia driver, clean installed windows 10 1803 for several times, tested other games and they had lags too, updated drivers related to my motherboard and even some strange things like testing it through another displayer...

And these are my pc specs:
MOTHERBOARD Asus B360 TUF Plus Gaming
CPU Intel I5 8500
RAM Team Delta 2*8GB 2400
VGA Msi GTX 1050ti GamingX
HDD WD Blue 1TB
SSD Crucial MX500 250GB

I will be really thankfull if you help because im in this weird trouble for a long time.