Hi,
Grab that extra RAM mate. Dual channel memory configuration brings stuff-all benefit for that processor platform unless you are using onboard video, and with your rendering I'm sure you're not doing THAT!.
The extra RAM will bring you more benefit than any other change you've mentioned.
I wouldn't be so confident that the XP2500+ would hit 2.2GHz. 2500+ chips manufactured recently have had the clock multiplier 'super-locked', and have not necessarily overclocked as easily as earlier examples. I've come across quite a few that struggle to run with stability at more than 100MHz above stock settings. If your Sempron is comfortably running at the settings you mention, then I'd suggest you simply add the extra RAM and be happy with it until you can afford a better upgrade later on.
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Grandad
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since Mar 2004