Pc Start To Lag after playing games!

[AsusExtreme95]

Hello guys my English isnt that good but i need help! to my problem now i played csgo for like 2 hours then i started to play League of Legends and after 20 mins my pc start to lag like hell my screen had many colors but really small pixel then it hangs up i had to restart and it worked fine again but i dont understand why this happens to me my system is new
PC Specs Processor: Intel 7700k
Motherboard: Asus Extreme VIII
Ram: Corsair Vengeance LED 4x8 GB
Graphics Card: Asus 1080 Ti OC 11GB
Power Supply: Corsair RM850i
Liquid CPU Cooler: Corsair 115i
Fans: Corsair ML 140 (x5)
SSD: Corsair Neutron XTi (240GB)
HDD: Seagate BarraCuda (2TB)

does anyone have any idea? that would help me alot ! thanks

 

[Carnaxus]

Run CPUID HWMonitor and watch your temperatures if it starts lagging out like that again. This sounds like thermal throttling.

 

[AsusExtreme95]

Run CPUID HWMonitor and watch your temperatures if it starts lagging out like that again. This sounds like thermal throttling.

hey man thanks for something atleast would a picture of my pc help somehow? if i set everything right? it was my first time build a pc my own i will run the programm then and see how it goes

 

[AsusExtreme95]

here pics of the stats i dont know if everything is fine 1. https://ibb.co/bX6Mna 2. https://ibb.co/f8cu7a

 

[Carnaxus]

Run a game with HWMonitor running in the background and then take some pics of the max temperatures reached.