the difference of Northwood

[Access]

there are different types of Northwood core, mention as Northwood, Northwood A, and Northwood B

what is the difference between three of them

thanks

Life just like a maze

 

[Schmide]

There is actually a C stepping now. There isn't much difference other than changes in voltage, heat dissipation and frequency. Basically Intel has tweaked its chips to get better performance. For the most part, the later the stepping the higher or cooler the chip runs.

Complicated proofs are proofs of confusion.

 

[CMRvet]

There is actually a C stepping now. There isn't much difference other than changes in voltage, heat dissipation and frequency

what about 100 and 133 MHz FSB?

<b>(<font color=yellow>as good as it looks</font color=yellow>)</b>

 

[Schmide]

Yes the B stepping introduced the 133/533 FSB. I lumped that into frequency. The new C stepping has a lower 1.475 voltage and is optically smaller. Both B and C have both 100/400 and 133/533 FSB depending on the processor.
<A HREF="http://developer.intel.com/design/pcn/Processors/D0102780.pdf" target="_new">http://developer.intel.com/design/pcn/Processors/D0102780.pdf</A>
and
<A HREF="http://developer.intel.com/design/pcn/Processors " target="_new">http://developer.intel.com/design/pcn/Processors </A>

Complicated proofs are proofs of confusion.

 

[chuck232]

I'm not sure what Schimde is saying, but there's only NWA and NWB. The NWA is 100MHz FSB, the NWB is 133MHZ FSB.

C stepping actually all run at 1.525V. They're only available for the P4 2.5(100MHz), 2.66(133MHz), and 2.8(133MHZ FSB) at the moment.

...And all the King's horses and all the King's men couldn't put my computer back together again...

 

[AMD_Man]

Intel is working on a post-C stepping that will use only 1.475 or 1.5V. The new stepping will be featured in the 3GHz P4.

Intelligence is not merely the wealth of knowledge but the sum of perception, wisdom, and knowledge.

 

[chuck232]

Oh... well current C stepping CPUs are all 1.525V.

...And all the King's horses and all the King's men couldn't put my computer back together again...

 

[Crashman]

Most people just call the 400MHz version the Northwood or "A" (so that a P4 1.6A is a Northwood, while a P4 1.6 is a Williamette), and call the 133MHz version the "B", even if those are not the core revisions.

<font color=blue>You're posting in a forum with class. It may be third class, but it's still class!</font color=blue>

 

[eden]

I was about to add that.

A and B are not steppings, but core revisions and additions, while the C stepping is simply named that way as a stepping model, not a core model.

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What made you choose your THG Community username/nickname? <A HREF="http://forumz.tomshardware.com/community/modules.php?name=Forums&file=viewtopic&p=19957#19957" target="_new">Tell here!</A>

 

[oymd]

B0 shrink:

Speed S-Stepping
1.8A SL66Q
2A SL66R
2.20 SL66S
2.26 SL6D6
2.40 SL66T
2.40B SL6D7
2.53 SL6D8

C1 stepping:

1.8A SL6LA
2A SL6GQ
2.20 SL6GR
2.26 SL6DU
2.40 SL6GS
2.40B SL6DV
2.53 SL6DW
2.66 SL6DX
2.80 SL6DY(?)

 

[oymd]

B0 shrink:

Speed S-Stepping
1.8A SL66Q
2A SL66R
2.20 SL66S
2.26 SL6D6
2.40 SL66T
2.40B SL6D7
2.53 SL6D8

C1 stepping:

1.8A SL6LA
2A SL6GQ
2.20 SL6GR
2.26 SL6DU
2.40 SL6GS
2.40B SL6DV
2.53 SL6DW
2.66 SL6DX
2.80 SL6DY(?)

 

[juin]

C1 stepping it also 1 bit faster 1% to 5%

At the end i have speak with a horny lady

 

[Schmide]

They did fix ~21 Errata (bugs) I guess that could allow code to execute that much faster.

When you read the 66 anomalies it's a wonder these things can run at all. But they do it. Do it well.

<A HREF="http://developer.intel.com/design/pentium4/specupdt/249199.htm" target="_new">http://developer.intel.com/design/pentium4/specupdt/249199.htm</A>


Complicated proofs are proofs of confusion.

 

[Access]

thank you for everything, now I understand a bit about these naming, but somehow getting more confuse about the stepping thing..

as far as I know the stepping only for the heat dissipation and voltage that used by the processor..

anyone???

Life just like a maze

 

[eden]

Steppings are simply when they look at the core's inside, and fix things and optimize layouts in order to make it a bit more efficient at heat or performance. Core designs and updates such as NW B and A, are the result of added components or upgraded ones. NW B updates to a higher bus.
It's not too hard once you forget that letter nomenclature.

--
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[Access]

thank you Eden

will you lead me where to find an explanation of these kind of things.. perhaps url..

thanks again

Life just like a maze

 

[juin]

They have solve 6 anormalie most of them are in cache as you can see P4 have now 0 cache erretas.You will find also info on produce notification change.

1 of them was resulting in cache alasing that was decraseing performance and according to some intel enginer reduce HT performacne so they was not able to think to activate on desktop.

At the end i have speak with a horny lady

 

[Schmide]

Congrats on the Honorary Title.

Complicated proofs are proofs of confusion.