I would also caution against seeing a laptop that says "RX 580" or "NVidia 1080" and assuming the performance of that GPU is going to be anywhere close to the performance of a full-up PCI-Express Desktop version of the same graphics card. Laptops usually make use of shared video RAM and or some sort of sharing between the "dedicated GPU" and the processor's on-board graphics adapter. I have a laptop with a dedicated NVidia 970GTX and it is about 40% slower than my Dad's 960 Ti at the same tasks.