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We simulated the Core 2 Extreme QX9770, as recommended by Intel, and can thus give you a preview of the processor's performance once it actually makes its way into the market.
Compared to the QX9650 that was unveiled three weeks ago, the QX9770 is exactly 5% faster across our benchmark suite. The fastest 65 nm model trails the new CPU by almost 11%.
We can't compare the performance to AMD's equivalent offering, since the benchmark results of the Phenom are still unknow and this Intel CPU is still nothing more than a paper tiger that won't be available in stores this year.
Overclocking the Core 2 Extreme QX9770 to 4 GHz übertaktet can boost its performance by about 15%, depending on the application.
FSB1333 Vs. FSB1600
So what can the buyer expect from the front side bus speed increase from 333 MHz to 400 MHz? With the processor overclocked to 4 GHz using each of the FSB speeds, thw faster FSB only showed a performance improvement of a meagre 0.5% - on average! The front side bus apparently has a negligible influence on performance, even at these high clock speeds. The performance delta measured here is so small that they may just as well be due to margin of error and fluctuating benchmark results.
The clear answer to our question is therefore, that the FSB speed increase does not translate into any kind of performance advantage for the end user.
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I am not sure why you are not mentioning the cooling system you use.
Also why you don't mention that this processor needs water cooling system even if not over clocked.
Looks like a Zalman fan to me in the pictures so maybe water cooling is not needed, at least for those not into cases (something I typically consider "benchmark machines" and was surprised by the lack of dry ice. By the way thermoelectric, chilled water, cooling using peltiers can't be beat! Finally I have a QX6850 and I get a 3mdMark06 of 18,548 with a Gigabyte EX38-DQ6 and a Shappire Radeon HD4870 X2 2gb (using not yet anywhere near perfected drivers) and without overclocking the GPUs until a water block is released for it. I was going to upgrade to a QX9770 now that I can pick one up for a good price since the 9775 came out but since reading that the difference in speed is not incredible I have decided to wait for the new Core i7 or whatever they call the new extreme processor and motherboards with new sockets coming out soon.
To show the QX9770 overclocked alone is bias as I run my QX6850 overclocked. When compared to the QX9770 running at stock speed, the QX6850 differs typically by a few points, it is not until the QX9770 is overclocked to 4ghz that the difference becomes as high as close to 20% in come cases. However, that ignores the fact that a lot of the other processors are good overclockers, and I can overclock my QX6850, using thermoelectric chilled water cooling, to a stable 3.8. Therefore, the difference between the two in terms of speed is not enough at this point to justify purchasing an X48 chipset motherboard and a QX9770 when a new socket and extreme CPU is coming out soon. If I was putting together a computer now I would likely go cheap and look for a used QX6800 and as good a used motherboard as possible just because I would be selling them soon anyway.