What to replace?

Help people need advice.
Well, for example, a friend of mine shoots a video of the passage of the game and he does it perfectly in terms of the video.
Everything is smooth and beautiful, I just tried it and was horrified. Take, for example, metal gear Solid V: The Phantom Pain. Fraps shoots well and without brakes. But the video weighs dofig. I tried the Open Broadcaster Software program, the professionals advised. but when shooting, it's not that the video lags, the game itself starts to glitch metal gear Solid V: The Phantom Pain.

What is the problem ?
Many people speak for the Motherboard with the process. And RAM.
Is it so?


Here are the systems:

Video Card model: r9 280x sapphire vapor-x