hey Scronan,
Your video card is probably fine.
Just make sure you have the latest drivers.
I would guess the biggest weakness on your system is processor.
The RAM should help a ton though.
But, if you want to upgrade your video card, I'd say go ahead, because new cards offer other benefits like Anti-Aliasing (nice in 3d RPGs IMO) as well as uber-speed.
I can't post any hardware->performance findings, because I don't have the game yet : (
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