Is the graphics card on this thing upgradable? Like can I put a GeForce GTX 670, 680, or even a 690? And what about the power supply? Is there one with more wattage for this AIO-PC? I just got this computer, and I am a heavy gamer now, but the 640M just isn't pushing what I want it to. It can run everything fine, but I would like to do so much more. So can this be upgraded?
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