Intel 64 Release Day

Here is a clip from Hot Hardware.
"As noted earlier, there are also a few new features that these Prescott 2M cores bring to market for the P4, namely Intel EM64T 64-bit extensions, EIST or Enhanced Intel SpeedStep Technology (6XX sequence CPUs only at the moment), and the Execute Disable Bit, all of which we'll dig into next."
In case you don't remember the disable bit can be hacked to allow you some extra headroom while overclocking

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