There will be games that you won't be able to reach fullspeed on if you go with AMD.
Intel HD 4600 is good up to 2-3x IR in Dolphin (depending on the game), and can play PC games on medium settings from what I've seen. But you'll be better off getting a dedicated GPU becasue they're way better at everything.
Dolphin relies heavily on the CPU. The GPU only needs to meet the minimum requirements for native resolution to run games. Any stronger GPU is just to increase the cool effects you can make Dolphin do.
Since you want to put Linux on the machine, I would recommend a Nvidia GPU since they have better Linux drivers.
Intel HD 4600 is good up to 2-3x IR in Dolphin (depending on the game), and can play PC games on medium settings from what I've seen. But you'll be better off getting a dedicated GPU becasue they're way better at everything.
Dolphin relies heavily on the CPU. The GPU only needs to meet the minimum requirements for native resolution to run games. Any stronger GPU is just to increase the cool effects you can make Dolphin do.
Since you want to put Linux on the machine, I would recommend a Nvidia GPU since they have better Linux drivers.