EDIT - OK, I'm an idiot! I saw that he already had 2 512MBs, and was adding a 3rd 512MB.
So I have a BS in Computer Science, minor in mathematics, MS in Software Engineering, but all are useless until I finish my morning coffee
And I still generally suck at addition/subtraction, even if I've had my coffee!
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Not to nitpick, but isn't 512x2=1024 ? So 2 512MB sticks of RAM would give you 1024MB, which is 1GB, NOT 1.5GB.
Be easy on me, my minor was in Mathematics, major was Computer Science. I'm usually terrible at arithmetic (think adding up the tip to the bill at a restaurant) and my wife gives me a hard time. I reply "but honey, I only minored, not majored, in math"