Chosen Solution

Hi I want to buy the basic model of the iMac 27 and upgrade it myself, it comes out much cheaper like that .. I saw that all the parts could be replaced but I did not see any manual to replace the graphics card. Was it soldered? Is it replaceable?

@danj gave the most compressive answer to this so far: Tear-down of new 2017 iMac 5k

The GPU’s in the ‘Thin Series’ are all soldered to the logic boards. Apple no longer uses MXM cards. Sorry, not replaceable.