A Ryzen cpu does not have integrated graphics. It's all cpu, Lcache.
The Raven Ridge APU's (2200G/2400G) literally took half of a Ryzen cpu and threw it in the trash, and replaced the missing half with a gpu. The Vega graphics isn't really an integrated gpu, like the small portion on an intel die, it's basically a standalone chip under the lid.
If you think of a Ryzen cpu as (made up dimensions) a 1inch square die inside the lid you can see, the 2200G is 1inch by ½inch cpu, 1inch by ½inch gpu.
It's like going to the store and they give you the option, for the same amount of money you can walk away with just the left shoe, or with both feet.
Intel is integrated gpu, it's still a whole cpu, but the sole of one foot has a different grip. Still get both feet.
That's all that was mentioned, if buying a cpu, why spend $150 for ½ cpu/½gpu if you aren't going to use it, better to buy a stronger whole cpu.
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That said, the gpu has nothing to do with fps. The gpu deals with resolution and settings. If in fortnite the cpu can only put out 150fps, it wouldn't matter if you sli 4x rtx2080ti at 480p, you still only get possible 150fps. The gpu is responsible to put that 150fps on screen. A Gt710 would suffer and not be able to get more than 30fps on screen at ultra, 50fps at medium and 60fps at low/min settings, but that's not adding to the total, nothing can. A gtx1660 could put fortnite at 150fps at medium, 150fps at high, 150fps at ultra. Because that's all the fps the cpu gives it. It's not a bottleneck, the info isn't slowed down, the gpu gets what it gets, period. Changing from a 2200G at 150fps capable to a Ryzen5 1600 means a stronger cpu, and 300fps capable, so the 1660 gets 300fps at medium, 270fps at high and 250fps at ultra. Or maybe 300fps across the board.
The gpu can never increase the amount of pre-rendered frames from the cpu, no matter what. A weak cpu = low fps limits, a strong cpu = high fps limits, the gpu is either strong enough to do the job, or not.