Intel revised its voltage regulator documentation the other day.
It confirms that Prescott will chew up a rather considerable amount of power: 78 amps max (page 13). Let me quote (all emphases in text mine):
“System boards supporting [PIV hyperthreaded CPUs] operating at 3.06GHz or higher and processor code named Prescott must have voltage regulator designs compliant to applicable
FMB electrical and thermal standards. For Intel Pentium 4 processors, this includes full electrical support of 70 A . . . specifications and robust cooling solutions to support 63A thermal design current indefinitely within the envelope of system operating conditions.”
It goes on to say:
“For processor code named Prescott, this includes full electrical support of 78A . . . specifications and robust cooling solutions to support 68A thermal design current . . . indefinitely within the envelope of system operating conditions.”
You can see that the numbers for Prescott are up about 10% over that of the Northwood PIV. This could cause some problems with current PIV mobos.
That’s not the point of the article, though:
Intel also put out an “addendum” to the power requirements for its Extreme Edition processors, and here’s what it says (page 15):
“System boards supporting Pentium 4 processor Extreme Edition . . . should have voltage regulator designs compliant to the FMB parameters defined in Table 1. This includes full electrical support of 91A . . . specifications and robust cooling solutions to support 80A thermal design current indefinitely within the envelope of system operating condition.
You can see that Extreme Edition demands much more from a mobo than Prescott, which makes you wonder what mobos can work with it. If a current 865/875 mobo can’t handle Prescott electrically or thermally, it sure as hell can’t handle an EE.
However, there is a silver lining in this cloud for those of you wondering whether or not Prescott will work with your mobo. If it turns out your mobo company says your mobo can handle an EE, it ought to be able (at least electrically and thermally) to handle a Prescott (though it might not overclock quite as much as it might with a newer board).