Anand touched on this during his 2Ghz P4 review. The Firing Squad review is just an indication of things to come, but it makes a good read
As you can see in our test results, the faster bus speed basically buys the Pentium 4 the equivalent of a 200MHz clock speed boost once the system is also equipped with 1066MHz RDRAM. In our tests, this essentially results in a 9% performance improvement. Keep in mind that this is a very rough figure as our video card was overclocked and therefore running out of spec. This figure also varies from application to application, and is only valid for our results at 1.6GHz. By the time 533MHz systems are commercially available Pentium 4 processors will be running well in excess of 2GHz, therefore the gap between 400MHz and 533MHz systems should be a little larger
As you can see in our test results, the faster bus speed basically buys the Pentium 4 the equivalent of a 200MHz clock speed boost once the system is also equipped with 1066MHz RDRAM. In our tests, this essentially results in a 9% performance improvement. Keep in mind that this is a very rough figure as our video card was overclocked and therefore running out of spec. This figure also varies from application to application, and is only valid for our results at 1.6GHz. By the time 533MHz systems are commercially available Pentium 4 processors will be running well in excess of 2GHz, therefore the gap between 400MHz and 533MHz systems should be a little larger
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