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The processor we used for testing was a 1.7 GHz Pentium 4 with Willamette core, even though the new form factor may make you believe it was a 'Northwood'. Please note the significant difference in size between the old and the new model.
Socket mPGA478 is of course also much smaller than Socket423 and the pins are much closer together than in the previous socket. The retention mechanism has not changed, but due to its small but clumsy shape, it is a bit fiddly to take the new Pentium 4 out of Socket478.