Using the iMac for display only?

I bought an iMac in 2008. I use it for the majority of my computing needs, and for the most part is serves my purposes for everything. One thing I would like though is more gaming power.
I have a PC tower that is not connected to anything at the moment and needs a little hardware work which I will do myself.
Since the iMac is not user upgradable, and the video/graphics card is not upgradable at all, I was curious if I was able to connect the PC tower to the iMac's screen and use it as a display for a gaming computer and disconnect the tower for regular computing.
While I'm asking, is there any external way to improve the graphics card for gaming that anyone is aware of?

...Its too bad the graphics card is not upgradeable. I'm also going to try and find out if there is some sort of external way to increase performance....
This is the inherent issue with all "all-in-ones", both laptops and desktops, both PCs and Macs. For the most part, they are not upgradable. You can replace HD and RAM, but pretty much everything else "is what it is" and upgrades are "external only." Don't hold your breath that you'll find any way to increase performance (video or CPU.)
In the long run, you may want to consider just selling the iMac and get a new Mac. A Mini or Mac Pro, both of which do not have built-in monitors so would require you to get a monitor anyway, then you could KVM it with the PC. (I have my Mini KVMed with a Dell Poweredge server, which is sitting under my desk.) Alternatively, the new 27" iMac does allow for video input so it could be used as a monitor for the PC.

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