Hey JD,
Not everyone in the world overclocks or cares about getting low differentials from the chip to the water. Three gph is way more than enough to keep a stock chip stable. Given water's heat capacity and say, 75 watts, 3 gpm results in a water temperature rise of about 8°C. Take a block that has surface area more on par with a normal air-cooled heatsink and you would do just fine.
Take a gander at the HSFs packaged with CPUs. These typically let chips run much warmer than the DIY crowd would like, but obviously they do work. This is little different.
For the record, the Centrino is not the mobile P4. It is more akin to a mobile P3. There is indeed a mobile P4, but it is the Centrino that runs much like XPs, ie lots of work per clock cycle.
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