I'm AMD all the way. Right now, dual core AMD processors are much less expensive than the Intel Duos. Also, AMD's
bus speed on their processors and supporting motherboards are much better when it comes down to price to performance ratio. Yes, Intel has faster boards and processors, but you're going to be paying a very large sum of money for them too.
So far, I'm able to run anything I can get on my computer and my comp isn't really all that great anymore (AMD 64 3400+ with a gig of dual channel DDR400 and a 6800GT AGP graphics card). And I can run HL2 and BF2 on pretty much full settings (maybe AA down from 1 below max) without the frame rate dipping below a good performance level.
If you want to be able to have great system at a somewhat budget price, go with AMD. I have nothing but good things to say about them. I just finished helping someone out with building a really sweet system for under $1,000 and it would easily contend with the XPS systems from DELL and the other high performance systems from other manufacturers (Although it didn't have a monitor, mouse, keyboard, or speakers). And it's an AMD machine and not Intel like all the major brands use.
Duos and other Intel processors with similar bus speeds to AMD's are running for $350 to $900+. I won't lie to you though. There are Intel processors out there (even dual cores) for less than $100. But their bus speeds, which I can't seem to stress enough on how important that is, are only like 533 MHz which is about 1/3 of even a budget AMD processor. Hell, a $50 AMD 2800+ has an effective bus speed of 1,600 MHz with most having 2,000MHz.
You can't just look at the number of it's operating frequency, like 3.4 GHz, and say it's superior to another chip with a speed of, say, 2.4 GHZ. You have to look at the overall chip and motherboard speed (among other things). A chip could have a potential of running at 5GHz, but it doesn't mean jack if the bus of the chip and motherboard can't handle that kind of traffic.
As it stands right now, there aren't many programs out there right now that will harness a dual core processor's potential. It will mostly be grinding away with one. I'm not saying that you shouldn't get one, but unless you're going to be doing higher-end, prcessor intensive work, like watching a DVD while redering stuff in 3D, you won't really need it.
I may have more later.
- Riplox