It's possible change iMac hardware?

I want to buy a new iMac from from the apple store online but I want to know if in the future I can change the hardware of my computer like ram, hd, CPU, graphic card in an apple centre... Is it possible or my iMac will be always the same? Can I upgrade it? Thanks

Only the RAM is considered an upgradable part on iMacs.  The harddrive however can be replaced if it fails by Apple.  Unfortunately the graphics and CPU are not upgradable on iMacs.  If you need to be able to upgrade the computer's major parts in years to come you should consider buying the Mac Pro, which is a far more versatile unit.

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