How good and fast would the pc be if i had these parts and how much fps would it have with gta or fortnite or cod?
Depends on the setting. In Full HD on high settings approx. 60 fps
Never get PC hardware from Amazon. This is much cheaper.
I built a PC with an RX 5700 XT for my friend and it crashed as soon as the graphics card was under a light load. I'm usually an AMD fanboy, but since then I've been leaning towards Nvidia for graphics cards. I then swapped it for an RTX 2060 and since then the PC has been running like clockwork again
Unnecessary power supply if you don't plan to use a high end graphics card.
A power supply with 450W is enough.
Not only because of the price, but also because of the quality.
Maybe he had a broken graphics card