3dhoc :
Seriously, this is laughable.
The ONLY reason not to get a quad is that you're dedicating yourself on just one/two apps at a time...
You have to consider that the OS consists of A LOT of services that would run on the free cores, dedicating the other cores completely for the game.
How 'bout that?
Or you live in a cave and use Windows 2000 that knows nothing of threaded optimisation?
This logic is BS. Sure the OS consists of alot of services that are running. But NONE of them are actually cpu intensive. If the game in ? doesnt actually scale to 4 cores itself then the extra cores for OS stuff means nothing.
The more cores the actually game/app can use is what makes if perform better. Not extra cores for the OS to run svhost.exe on.
You also dont need a quad just because you only run one or two apps at a time. You can run 30 apps at a time easy on a dual core. It just depends on what the apps are. For example. I will have a brower or two open sometimes(no not tabs but opera/firefox at the same time), winamp, itunes, mirc, google earth, use winrar to extract some files, VLC, pidgin... Now is this multitasking? NO. The only things out of those that are going to use some cpu resources are winrar and vlc with hd content. If you wanted to use winrar+video encode+antivirus scan+audio rip/encode and play WoW then a Quad would be very usefull.
I would still get the quad at this point in time myself though. I would save some money and get a x4 940 black edition though. I wouldnt pay the extra money for the 200mhz+ddr3