change the graphics card in my iMac 27 (Mid-2017)

change the graphics card in my iMac 27 (Mid-2017) Hello! Can I replace my graphics card Radeon Pro 575 4GB with a more powerfulRadeon Pro 580 8GB ? If so, how can I do this? I will be grateful for the instruction.
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bert [Entry]

"You can't replace, but you can add:

https://developer.apple.com/development-...

or

http://www.sonnettech.com/product/egfx-b...

These are external adapters that ONLY work with Thunderbolt 3, which your computer should have."