I just purchased an IMAC to run x-plane 10 and it does just fine now I want to get x-plane 11 but it says I need a 4 gb graphics card minimum to run x-plane 11 mine has 4 ghz, 16 gb ram and 2 gb graphics card but i am sure you are aware no way to upgrade the card in an IMAC question is can I still run x-plane 11 with what I have??