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I would say you will run a risk from the PSU. Just like an old engine, if you start hammering it for more, even if it could handle it when new, it may revolt. 5 years is a long time for a PSU in service. bump it up a bit.
The choice is wider than just the memory size. You want the graphics to be lush, or just functional? In other words, how much processing power do you want from the video card? Nvidia, or ATI? Will it have any connections that your current PSU doesn't cater for?
As you see, the PSU is all important.
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