IMac Graphics card (help please!!)

Hi there!
I am using the newest iMac 21.5 inch with the 2.7 ghz i5 and the nvidia gt640m. I really want to play RCT3 which was released on appstore not too long ago, and the macchecker on some gaming website says my graphics can handle, but the list of supported graphics cards on the mac appstore page for the game lists the following as compatable:
NVIDIA GeForce 8600, 8800, 9400, 9600, GT 120, 320M, 330M, 650M
Does this mean that my GT640M will not be supported like the GT650M and other lower end graphics card are? I know that this game also supports intel HD 4000, I might even be willing to purchase an MBP with HD 4000 to play this game (if I haveto.) Any help would be greatly appreciated.

Hi, I'd tend to think they just haven't tested the 640M, since far lesser cards are supported.

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