I have 512 megabytes of RAM and my processor is a 1.7 GHz Intel Celeron. I do a lot of multitasking on the computer, I don't usually run it above 80% used RAM but that makes it very sluggish. I am wondering which I should upgrade first, processor or RAM. I don't have enough money for both and I'd be upgrading mostly el cheapo as it is. Which upgrade would give me more speed for the spend in this case?