twerppoet
iPad Fan
Which devices are compatible with Metal?
Metal is a developer tool for creating low level access to the GPU (Graphics Processing Unit). In theory, it should affect every device that runs iOS 8; providing the developer uses Metal in their app. It only makes sense to use it for games and other apps with heavy graphics.
I admit, this is half guess work, and I could be wrong, but I'm pretty sure I'm at least mostly right, and that Metal has little to do with hardware; other than making more efficient use of the GPU.
That said, I have no idea how much improvement you'd see on older devices.