
Before talk of Intel's July 22nd price cuts surfaced, we were hardly ever asked the question "dual or quad", simply because the price differential was so great. After next week everything changes, as you'll be able to pick up a quad-core Q6600 (2.4GHz) for a measly $266. At the same time, you could get a much higher clocked dual-core E6850 (3.0GHz) for the exact same price - so which do you pick?

This graph is a lot more colorful than our previous ones because the decision just isn't that clear. If you look at the average, quad-core gains an advantage over dual-core over all of our benchmarks, but if you look at the tests themselves you'll see some trends. Encoding and 3D manipulation benchmarks have the quad-core CPU clearly ahead, while general usage and gaming benchmarks mostly favor the higher clocked dual-core E6850. So, which do you choose?
If you're strictly building a gaming box, you'll get more performance out of the dual-core E6850. However, if you do any encoding or 3D rendering at all, the quad-core Q6600 is a better buy. Our pick is the Q6600 and if you want to make up the performance difference you can always overclock to E6850 speeds, but the chip only makes sense if you're running apps that can take advantage of four cores. As the chart above illustrates, those applications are almost exclusively limited to video encoding and 3D rendering.
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Despite theoretical showings on paper, the 1333MHz FSB appears to do very little for performance even when feeding four of Intel's fastest cores.
I've been wondering how older motherboards will work with the new FSB1333 processors. Specifically I'm interested how an ASUS P5W DH Deluxe without the latest BIOS would react to having e.g. an E6750 dropped in. ASUS claims support for FSB1333 processors for the P5W DH Deluxe as of 2205 beta.
Would the system boot and run using a pre-2205 BIOS (although not at peak performance), so a BIOS upgrade can be performed? Or would the system fail to boot at all, like when the first Core 2 Duo processors surfaced and needed a BIOS upgrade to run at all on certain boards.
The reason I ask this is that I've my eyes set specifically on that board (I have several reasons, ECC memory support being one of them). I had originally planned on getting an E6600 after the July 22 price cuts, but right now there's nearly no FSB1066 processor to be had locally. Also, I'd of course love to have a access to the latest processors in any case.