Zmanner, what are the rest of your system specifications? That x1800 might be a better upgrade path if you want to keep it balanced, also, I assume that as you've apparently found an x1800, it's cheaper, or free for you, and you just want to know if your current PSU will handle it?
My memory is getting all gooey, but I think the 280W PSU you provided, depending on the brand of it, should be sufficient.
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