Yeah I realise that Xaak, but I was surprised by the difference in output.

I am curious though, if the P4D is so good, why did the come out with the Conroe, as in the specs I see no difference other than manufacturing technique. Checking SETI stats the P4D seems to have the dge, at the moment, although i suspect that this is due to the higher frequency, once the Conroes achieve the 3.2 to 3.4GHz mark of the P4D I think the Conroe will blow them out of the water looking at the stats.

They already do. Running optimized apps, and both series overclocked to the maximum I can run them stable with little vcore adjustment (D's at 4000Mhz, C2D's at 3400 Mhz), my C2D's are doing 2440 RAC vs. the D's 1800, and with half the current draw. (230 watts vs. 125 watts)

The Pentium 4 NetBurst architecture allowed the chips to achieve higher speeds, with good memory bandwidth, at the cost of IPC's, or in real world concerns, math calcs. The Core lineup is a revamped version of intel's Israeli division that developed the Centrino laptop cpu series. They took the old p3 design, tweaked it for higher scaling and lower power use, and ended up being a very powerful chip for math calcs.

Intel's Prescott design was the fall of the P4 lineup, as it was merely a patch to get more clock speed out of that design, with the huge drawback of power consumption. Those are some power hungry cpus. Since chip makers have more or less hit a ceiling with current fab techniques, the trend is for more cores on die for more cpu pwer, rather than higher clock speeds.