Yes, the GPU is connected via a soldered PCIe connection, just as the keyboard, track pad & camera are connected via USB (internal dedicated connections).
+
Yes, the GPU is connected via a soldered PCIe connection, just as the keyboard, trackpad & camera are connected via USB (internal dedicated connections).
Sorry, no you can't replace it.
Yes, the GPU is connected via a soldered PCIe connection, just as the keyboard, track pad & camera are connected via USB (internal dedicated connections).