I can agree with you until I see two Thunderbolt ports and an HDMI port. How does an Intel HD4000 drive the native Retina and three external displays? It will take a 650M to drive them, will it not?
I was convinced Apple would only include the Intel HD4000 until I saw that port configuration. I don't get what else it could mean? Apple only allows one TB port to work for display? Or either a TB or HDMI port can work, but not both simultaneously with displays connected?
I just don't see the same concept of two 27" ACDs, a Retina native display, and a 1080P HDMI display all driven by an Intel HD4000.
Please explain what the port configuration means. I completely agree that there isn't much room for a dGPU, but I am not an computer science engineer. Less the optical drive, and the same thickness as the 15" rMBP, and there is no way for a dGPU?
Thanks in advance for your reply.
There will not be a discrete GPU unfortunately.
If you look carefully at the photo of the cooling assembly inside
you'll see only one heat sink. Compare this with the 15 retina
Notice the heat sink marked "GPU" on the 15 is not on the 13.
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