You don't have to run it as this resolution you know?
You can run it at virtually anything you like UPTO 1920x1200. You will probably find the optimal resolution is something like 1280x1024 or something similar but you don't even have to run it as high as that if you don't want to. Its up to you.
You can alter it to suit yourself so it doesn't cause problems. I would however be wary of buying a damaged on and how do you know he is trusted? Do you know him personally? What sort of guarantee do you get?
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