without much else to go on, I'd say the weak point is the CPU/OS - depending on your motherboard/power supply the CPU is ripe for overclocking, which would undoubtedly help - 3-3.2GHz should be doable with stock cooling, 3.6 and up to possibly 4GHz with decent cooling. That might not be your thing though - but I'm surprised you're having problems with graphical effects, considering you're running a GTX 580; I'm deducing that the CPU must be chocking trying to feed the GPU with the information it needs.
Windows 7 would be a viable upgrade too - I'd advise anyone to do that upgrade if they have the cash to spare.
e: hah, nanja'd
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