I bought a top spec iMac a few years ago for working on Unreal 4 projects in my spare time and doubling as a dayjob machine, and sure enough I wanted a better G

I bought a top spec iMac a few years ago for working on Unreal 4 projects in my spare time and doubling as a dayjob machine, and sure enough I wanted a better GPU a couple of years later and went and bought a PC. Amusingly UE4 is actually one of the sample screenshots in the linked page. Nothing Apple does can really compensate for the rate at which GPUs get quicker, and putting an AMD one in there is doubly irritating since that's not what the majority of the market uses. So each time you want to upgrade your GPU, you're also having to purchase a new screen. The difference in my case was between having about 10fps with a lot of debug draw in the UE4 editor on the iMac, and about 90fps for the same thing on a new PC with a 1080. About the only good thing about the iMac was that it held its value remarkably well, and I sold it for half the purchase price 3 years later.