I'm sure by design, Dell's usually don't upgrade very far. Look for a service tag on the back of your machine and go to the Dell site for info about your system. The forum there can also be useful for this topic.
Well of course it would run better, but it's still extremely usable on 256mb. I can't really see how much faster it could be. The only thing my computer(s) slow down for is big games and multiple programs all loading at once.
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