What can cause short-term lags (microfreezes, statters) in games?

Question

Iron

Here is an example. During jumps on frametime , lags occur in different games. What could be the problem? System configuration: i7-8700K, GTX 1080Ti, 16Gb RAM, SSD 970 EVO 500Gb, Z370XP SLI, Win 10 Pro OC.

Answer 1

Network - the network is naughty. With all the overall high speed - in fact, this is an average speed. At some point, there can be stupid. Even if you have fiber optics, it can be stupid somewhere along the way to the game server.
Or the server is down. Can not get in time. However, since this is in a different game (if these are different game manufacturers, then different servers) is not a game server.
If the game is local, then most likely it is swapping from disk to RAM or (more likely) to the video card. Due to the poor work of the game developers (tyap-blunder) or too high quality settings, for example, for 4K, I won’t be surprised.
Try it on AAA class games, there are usually no jambs so obvious. Try lowering the resolution and so on. Quality. If the lags remain even after that, then it's not the video card and processor, but rather the Internet.
It can dull due to the inclusion of throttling (speed reduction) due to overheating of the processor / video card, with poor cooling. You can hardly see the temperature so easily. When you start watching it after the lags, throttling has already worked and the temperature has dropped. To observe the temperature - you need to monitor it constantly, then analyze the graph for the elapsed time.
Unlikely, but possible, due to poor power supply. The power supply you have, although not the best choice, is acceptable if it is working. I would check the voltage in the network 220 volts. Maybe unstable. And I would put a voltage stabilizer, and already I would include a computer in it. The voltage stabilizer is servo-driven, ferroresonant. But not thyristor, not relay.
The configuration given by you does not say anything, since the games can be very, very different.
If you put the latest game in maximum settings, then this configuration will not be enough.
However, looking at your configuration, I will assume that it is most likely that the matter is in the Internet, which does not depend on your equipment.

Answer 2

It just overloads somewhere above the stated requirements for the computer