Solved It S Possible To Replace The Graphic Card Imac Intel 27 Emc 2429

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It’s possible to replace the graphic card? If yes, I can use a standard graphic card like this or I must use a “mac edition” graphic card?

You’d have to use a Mac OEM or OEM upgrade… you’ll have driver and upgrade problems for the entire machine if you don’t. If you want a Mac on which you have more latitude in VideoCards you need a full desktop model MacPro.
Since you gave a rather generic ID you get a rather generic reply. Some of them (i5) had an AMD Radeon HD 6770M graphics processor with 512 MB of dedicated GDDR5 memory. While some of the (i7’s) got an AMD Radeon HD 6970M graphics processor with 1 GB of dedicated GDDR5 memory (standard), or, a custom configuration, the same graphics processor was equipped with 2 GB of dedicated GDDR5 memory. If this Answer is helpful please remember to return and mark it Accepted.

YES it is not just possible, it has been done repeatedly with success. Please see: 2011 27" 2429 Upgrade GPU - Graphics Card