Archived from groups: alt.comp.periphs.mainboard.asus (
More info?)
For what its worth, I installed an Pentium 4 3.2 GHz (BX80547PG3200EJSL7PW)
in the P5P800 MB and it works just fine. Whether it will save me a couple
dollars a year in electricity I don't have a clue. I'll take Intel's word
for it!
"Paul" <nospam@needed.com> wrote in message
news:nospam-2801052303570001@192.168.1.177...
> In article <6-qdnQFNOdghKmfcRVn-hQ@comcast.com>, "Ken"
> <krlorenz@comcast.net> wrote:
>
>> It better, since I just bought a Pentium 4 3.2 "J" version and a P5P800
>> MB.
>> I did talk to ASUS customer support before buying and they indicated that
>> it
>> should work as long as the MB Bios was 1002 or greater. I'll let you
>> know
>> in a couple of days if I was lead down the wrong path. The biggest
>> problem
>> I had after reading the Tom's Hardware article was trying to get
>> ZipZoomFly
>> to tell me what was on the Intel CPU Box I wanted to purchase. I was
>> never
>> successful!! I guess you buy from ZipZoomFly and hope. Unfortunately
>> they
>> seem to have all the latest stuff at the right price.
>>
>> "Bernhard Kornberger" <dontuse@gmx.net> wrote in message
>> news:41fab193$0$10836$3b214f66@aconews.univie.ac.at...
>> >
>> >> Why not send the question to Asus tech support ? Paul
>> >
>> > It's a support -> they do not anwer :-/
>> >
>> > Bernd
>
> Well, I hope you won't be disappointed. The datasheet I referenced,
> doesn't show any savings for the two slowest processor speeds.
> Maybe I should be looking at a different datasheet for the "J"
> processors...
>
> I'm only guessing at this, but the Prescott family has two
> multiplier settings. There is the "normal" multiplier setting,
> which is defined by the speed grade of the processor you bought.
> There is also the "fallback" multiplier, and it appears to be
> 14x. In other words, the slowest processor in the family is
> 200 x 14 = 2.8GHz. A 2.8GHz processor has no where to fall
> back to - it runs at 2.8GHz in "normal" mode, and it would
> run at 2.8GHz if there was a situation where the fallback
> multiplier was called for. The 3.8Ghz processor would fallback
> to 14x multiplier.
>
> As near as I can tell, the enhanced halt state involves using
> a FID/VID change and halt at the same time. The docs I was
> reading today, didn't state specifically that the processor
> throttles back to the 14x multiplier, but that is the only
> setting I've seen mentioned before (for the PRB - platform
> requirement bit issue, which was handled in a BIOS upgrade
> a while back).
>
> What all of this means, is a 3.8GHz processor has the most to
> save, as the difference between running at 3.8GHz and 2.8GHz
> should give a large power saving. Changing from 3.0Ghz to
> 2.8Ghz would give a smaller saving.
>
> I hope you have an ammeter to measure the current in the
> ATX12V 2x2 power connector. I have a 2.8GHz S478 Northwood
> processor, and idling in Win2K, the Vcore circuit draws
> 1.1 amps at 12V, or 13.2 watts. I use a clamp-on DC ammeter
> with a Hall probe sensor to convert magnetic field to amperage
> reading (no need to cut the cabling). You'll need some
> kind of ammeter, to get an idea of whether the feature is
> working well or not. Unless there is a way in the BIOS,
> to select Halt or Enhanced Halt, there would be no way
> to compare the two states.
>
> VRD 10.1 defines the D-VID feature for the LGA775 processors.
> That allows the Vcore to be reduced to the processor, by
> changing the VID bits on the fly. But being a Vcore
> specification, there is no mention of how the multiplier in
> the processor is treated.
>
>
ftp://download.intel.com/design/Pentium4/guides/30235601.pdf
>
> Paul
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