Yeah from some of the charts I have seen ,its more worthwhile now to go quad ( maybe a couple of years ago you could make the dual arguement,I guess).Thats why back in Jan. when I rebuilt a new rig I went ahead and got an I7 instead of a dual core,especially since I tend to keep a comp. till its ancient.My old computer was a P4 ,Agp That I had about 6 1/2 years and it was struggling with the new games even on low settings.LOL.
Well really your OS is the core of what would take advantage of a multi core system.
For example, I have an iMac at work which is my work desktop. On my iMac every day I have the following running:
ARD admin
Email client
Web browser
up to 10 terminal windows at any given time
Casper Remote
Casper Admin
Composer
Excel
Word
iChat
iTunes
server tools (WGM, Server monitor, server admin, etc)
Passenger
TextWrangler
All of these apps tend to almost kill my machine as it only has 1 gig of RAM and a C2D processor. However, for how low my specs are it handles them rather nicely. I mean I have them all running at once all day all the time every day. I try to avoid using Excel as much as possible as I HATE spread sheets, but I gotta use it.
If I tried running that on a Windows box with 1 gig of RAM you could say forget about it. So not only is multi core processors important for performance it is also important how you OS utilizes them in every day usage.
I hear Windows 7 is way better at memory management though, so I will have to wait to see how it pans out.