800 * 600 doesn't look too bad. As for overclocking, I doubt that you'll be able to do this enough to make a noticeable difference, though it might be worth a try. Watch the temperatures though, and don't push your luck, otherwise you'll be getting a new graphics card whether you like it or not.
Have you tried the alternate fictional maps - they were designed for online, so they probably have less detail, and they are much smaller.
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