CPU cache MOD ?

[OptimalOptimusPrimus]

IS there away to Add more Cache to an CPU ?

like take two of the same cpu's like two 766mhz celeron's and take the cache off of one and add to the other ? .. Or add even more like make it have 1 or 2 megs of cache ? can this be done & if u seen a website do this .. PLEASE post a link i wanna see this.

[ootput]

The only trick i've seen with the Celeron was the Pencil-mod trick. I'm not familiar with any cache-coupling.

[davemania]

no

[allfive6]

nope but feel free to try tell us what happens

[fAlCoNNiAn]

no its embedded into the core.

[OptimalOptimusPrimus]

on a celeron there's lil chips underneath the cpu.. on the bottom of it.. and there are sum missing..

[antally]

No, the L2 cache has been on the die since the P3 days. Celeron has always had it's cache on-die.

[OptimalOptimusPrimus]

DUDE .. its' the L2 cache it's under the CPU on celerons.. that's how they make celerons .. there the same as a pentium 3.. but with half the cache !

[voidpharoh]

I believe that answer to that would be No, because the cache should be embedded into the processor die.

[OptimalOptimusPrimus]

GUYS .. i'm talking about the L2 cache..it's on teh underside of the cpu ..I will find a pic to show what i'm talkinga about.

[antally]

Umm, I think you're a little bit confused on exactly what the cache is...

[kawai]

  OptimalOptimusPrimus said:

DUDE .. its' the L2 cache it's under the CPU on celerons.. that's how they make celerons .. there the same as a pentium 3.. but with half the cache !

584771092[/snapback]

the stuff you think are cache are actually capacitors, not cache, cache in the celeron processor had always been embedded into the core logic.

[OptimalOptimusPrimus]

http://www.karbosguide.com/images/_977.jpg look at the chips beside the cpu core.. that's L2 cache right

[Martog]

No, those are capacitors or something else. Besides, isn't a 766MHz Celeron one of the FCPGA type CPU's with the core exposed like the Athlon Tbirds and XP's? If so, the cache IS embedded in the core and no way to remove it. I remember when AMD put 512KB cache onto the Athlon XP's, the core itself got bigger.

That's what your Celeron looks like no doubt, since it would be P3 Coppermine based and not off the P2 cores like the 500Mhz and slower Celerons (maybe 550 as well?) But yours has the core exposed like that, and the cache is in that core, NOT anywhere else on the CPU.

[antally]

No, those are capacitors. The cache is in the processor die, which is under the metal plate in the center.

  OptimalOptimusPrimus said:

http://www.karbosguide.com/images/_977.jpg  look at the chips beside the cpu core.. that's L2 cache right

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[OptimalOptimusPrimus]

These two types are, of course, Level 1 and Level 2 cache. Cache acts as a middle man between your processor and your main memory subsystem, instead of wasting time going directly to the memory for a data request, your CPU can request data directly from its Level 1 (L1) cache which is located on the processor itself or from the system's Level 2 (L2) cache which can be located anywhere from the processor itself to the motherboard depending on your CPU.. I will post a pic of my celeron 766mhz cpu .. UNDER the green board in that pic u posted.. is the L2 Cache lol I promise .....Otherwise how would Intel be able to remove it ..take the pentium to a celeron .. they remove Half the cache. from 256K .. to 128 K

[Martog]

How about I go find a core shot of the coppermine CPU's then? I am sure there is one that points out exactly where the L2 is. And how does intel cut the cache? Well it could be hardware disabled, or it could be a very similar core, just the cache is cut in half physically and they are manufactured almost the same with the exception of that, still keeping costs down.

[antally]

Well, since you seem to know it all (the cache IS located on-die starting with the P3 and ALL Celerons, I am currently studying computer engineering, so I hope that I would know). Yes, you just need to solder a few more capacitors on the bottom of your cpu, then you'll have 4 gigs of L2 cache.

  OptimalOptimusPrimus said:

These two types are, of course, Level 1 and Level 2 cache.  Cache acts as a middle man between your processor and your main memory subsystem, instead of wasting time going directly to the memory for a data request, your CPU can request data directly from its Level 1 (L1) cache which is located on the processor itself or from the system's Level 2 (L2) cache which can be located anywhere from the processor itself to the motherboard depending on your CPU.. I will post a pic of my celeron 766mhz cpu .. UNDER the green board in that pic u posted.. is the L2 Cache lol I promise .....Otherwise how would Intel be able to remove it ..take the pentium to a celeron .. they remove Half the cache. from 256K .. to 128 K

584771185[/snapback]

[Martog]

HERE we go, this will stop this non-sense right now...

  Quote

The part that all other 0.18-micron Intel CPUs have been derived from is the Pentium III based on the Coppermine core with 256KB of on-die L2 cache operating at clock speed.

Yeah, it says ON-DIE L2 cache, which means its on that little black rectangle. :)

  Quote

The new Celeron processors are based on a variant of the Coppermine Pentium III core.  Internally, they are based on a core known as the Coppermine128, which refers to the 128KB of on-die L2 cache they are outfitted with versus the 256KB that is on the regular Coppermine Pentium III core.

Overclocking the FC-PGA Celeron - AnandTech

[raggety]

what i want to know is how to turn on the unused cache on the celeron M.

http://www4.tomshardware.com/mobile/200403...entrino-01.html

Edited October 20, 2004 by raggety

[kawai]

  OptimalOptimusPrimus said:

These two types are, of course, Level 1 and Level 2 cache.  Cache acts as a middle man between your processor and your main memory subsystem, instead of wasting time going directly to the memory for a data request, your CPU can request data directly from its Level 1 (L1) cache which is located on the processor itself or from the system's Level 2 (L2) cache which can be located anywhere from the processor itself to the motherboard depending on your CPU.. I will post a pic of my celeron 766mhz cpu .. UNDER the green board in that pic u posted.. is the L2 Cache lol I promise .....Otherwise how would Intel be able to remove it ..take the pentium to a celeron .. they remove Half the cache. from 256K .. to 128 K

584771185[/snapback]

again, those are capacitors, elements that basically storage voltage (think of it as a temp. battery)

intel disabled the 128kb of cache on your celeron, and there is no way to enable it back period.

[OptimalOptimusPrimus]

OK here are 3 pics of my Celeron 766mhz cpu Socket 370

SO what are the little things under the Chip. .and what are they for ? and WHy are there sum missing :o) ?

[kawai]

  OptimalOptimusPrimus said:

OK here are 3 pics of my Celeron 766mhz cpu Socket 370

SO what are the little things under the Chip. .and what are they for ? and WHy are there sum missing :o) ?

584771256[/snapback]

god damn it, they are not missing, it's just that this is the setting for the celeron (possibily same for the PIII coppermines too) but changing those caps won't help you to enable your phantom cache at all.

[Martog]

They are probably just capacitors and who know swhy they are missing, could not be needed in the Celeron design model, but those are NOT cache chips, as stated, the cache is on that black rectangle that sits ontop of the CPU. Further reading into that Anadtech article reveals that the Coppermine Celerons are not P3 rejects and do not have the cache disabled, the extra cache is just not there and there is NO way to put it there. Read the anadtech article, it goes into the cache about the Coppermine Celerons, and how it is slower and what not, but yeah, you are stuck with 128KB of cache, starting with the Coppermine cores for Intel, the L2 cache was moved onto the die, and still is there today in the P4's, Pentium M's, Xeons, and Celerons. Now the Xeons might have external L3 on the CPU board somewhere, but not sure.

Right from the article about the l2 cache:

  Quote

For starters, something must be made very clear about the Coppermine128.  When Intel produces a Coppermine128-based Celeron, they don?t simply take a regular Coppermine Pentium III and disable half of the cache, and the Coppermine128 isn?t made up from the Coppermine Pentium III rejects.  This we have confirmed from reliable sources inside Intel, and we?ve known this ever since the release of the Celeron.

[kawai]

  Martog said:

They are probably just capacitors and who know swhy they are missing, could not be needed in the Celeron design model, but those are NOT cache chips, as stated, the cache is on that black rectangle that sits ontop of the CPU.  Further reading into that Anadtech article reveals that the Coppermine Celerons are not P3 rejects and do not have the cache disabled, the extra cache is just not there and there is NO way to put it there.  Read the anadtech article, it goes into the cache about the Coppermine Celerons, and how it is slower and what not, but yeah, you are stuck with 128KB of cache, starting with the Coppermine cores for Intel, the L2 cache was moved onto the die, and still is there today in the P4's, Pentium M's, Xeons, and Celerons.  Now the Xeons might have external L3 on the CPU board somewhere, but not sure.

Right from the article about the l2 cache:

584771268[/snapback]

on the Xeons, the L3 cache is on die too, not exactly why they just don't increase the L2 cache instead, I might find out why after taking my VLSI course in a year or so though.