I believe these are “soft” limits, the only hard limit being it has to have two cores and DirectX 9+ compatible graphics chipset. I can run UE4 Editor on my MacBook Air (2 cores! 1.4 ghz, turbo boosts to 2.7 ), using built in Intel HD5000 graphics. With lowest settings, in editor, i can usually get 45-50 fps on third person template. Don’t have any experience with AMD APU’s though 