Upgrade mid-2015 graphics card to high-end model one?
I got a Macbook Pro mid-2015 Retina as a gift. It comes with the Intel Iris Pro graphics card. I heard upscale models have the AMD Radeon R9 M370X with 2GB of GDDR5. Is it possible to upgrade mine to one this card instead? The store this one was originally purchased from doesn't carry this model. Thanks.
MacBook Pro with Retina display, macOS High Sierra (10.13.2)