I'd have to disagree on this 1, I put 2x 512 in my old laptop on xp and it was like a new machine, boot times went from 3mins plus to under a minute and the whole thing felt much snappier.
Lol you did sort of you said ddr2400mhz and read it wrong ...sort of...lol I'm an upgrade junkie so I end up with all sorts laying around, plus if some one come to me with a totally dead PC I end up stripping out all the stuff thats still good and can be used elsewhere. I dropped a load down to a mates house and he built 4 P4 systems with it and I've still got a load laying about that needs sorting...