Also, the current 2015 model sold in stores doesn't have the discrete AMD GPU; that one was discontinued. What they sell today is an integrated, underpowered In

Also, the current 2015 model sold in stores doesn't have the discrete AMD GPU; that one was discontinued. What they sell today is an integrated, underpowered Intel Iris. The lackluster graphics performance is really noticeable with an external 4K display.