hey guys, i realized there was a mistake order in iMac Custom that i ordered a year ago. i didnt choose the AMD R9 395X rather than R395 without X. is it possible to upgrade after all of this? cause its still kinda fresh to me i never use it for hard task or anything since this iMac bought for music studio but the studio didnt set up yet until June or July2017 i believe, the monitor plastic still there lol. is it too risk for upgrading such a VGA from AMD R9 395 to AMD R9 395X the point is: 1. is it possible to upgrade VGA after i purchased the iMac? 2. is it too risky? 3. do i need to worry about perfomance if there was human error while upgrading? 4. does apple officialy claim this can be upgradeable after purchased? sorry my english bad. but thanks before!