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Jedi08
Joined: 03 Mar 2007
Posts: 463
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 Posted: Fri Mar 07, 2008 12:30 pm Post subject: AMD K6-2 400 AFQ |
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Whatīs wrong here ?  Will post a better pic, when i receive it.
Finally found this chip again...
Christian |
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Qwerty
Joined: 20 May 2005
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Location: Germany
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Jedi08
Joined: 03 Mar 2007
Posts: 463
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| Posted: Fri Mar 07, 2008 1:27 pm Post subject: |
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You have one more try Qwerty...
A small hint: ceramic |
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Windmiller
Joined: 24 Jun 2005
Posts: 1716
Location: Chapel Hill, NC
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| Posted: Fri Mar 07, 2008 1:29 pm Post subject: |
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Its the numbering in the bottom left hand corner.
It shows 26369 instead of 26351. |
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Jedi08
Joined: 03 Mar 2007
Posts: 463
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| Posted: Fri Mar 07, 2008 1:34 pm Post subject: |
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Yepp, that number normally indicates K6-III.
I donīt think itīs fake, because nobody would fake a K6-2 from a K6-III. |
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debs3759
Joined: 18 Jan 2006
Posts: 9477
Location: Northampton, Divided Kingdom
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| Posted: Fri Mar 07, 2008 2:05 pm Post subject: |
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Can you test the CPUID value? If it is genuine, CPUID will read 058C, otherwise it is probably 0591 (anything else is fake as well). 058C doesn't mean it is definitely genuine, just that it seems likely 
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Debs |
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Jedi08
Joined: 03 Mar 2007
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| Posted: Fri Mar 07, 2008 2:43 pm Post subject: |
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@Debs:
The question is if AMD used a wrong ceramic "body", or they tested L2-cache as defective and labeled the CPU as K6-2.
Is the CPUID fixed or changeable by microcode or something else?
Christian |
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debs3759
Joined: 18 Jan 2006
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Location: Northampton, Divided Kingdom
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| Posted: Fri Mar 07, 2008 3:50 pm Post subject: |
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CPUID is fixed in the K6-2 and K6-III, as it is the way to determine what it is. K6-2 didn't have a method to change any CPUID details.
The only way it is genuine is if the CPUID is 058C and they had the wrong carrier on the production line the day this was produced.
I can't see a way to give you any better info without a better picture and/or the CPUID value (CPUID being impossible to fake, but it is easy to put a different heatspreader on a K6-2 or K6-III).
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Jedi08
Joined: 03 Mar 2007
Posts: 463
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| Posted: Sun Mar 09, 2008 9:38 am Post subject: |
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> CPUID is fixed in the K6-2 and K6-III
So AMD had no chance to sell K6-III with defective L2-cache as K6-2? |
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debs3759
Joined: 18 Jan 2006
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| Posted: Sun Mar 09, 2008 10:48 am Post subject: |
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I would be surprised if they would just disable the die and sell it as a K6-2 if it is a K6-III core with damaged cache. It doesn't mean that didn't happen though...
As I say, for a chip like this that could be either genuine or fake, CPUID is the only way to tell which CPU family it is (ie K6-2 or K6-III). I personally think it far more likely that it is just the wrong carrier used, rather than the wrong cap or a cut-down core.
When you get it, I highly recommend that you test it with something like CPU-Z, when it arrives, so that you can get the CPUID code AND the actual Level 2 cache size. The results of that will make it possible to give a definite answer. Without that info, it is not possible to say YES or NO, as a picture does not tell what something is internally
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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| Posted: Sun Mar 09, 2008 11:35 am Post subject: |
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| debs3759 wrote: | I would be surprised if they would just disable the die and sell it as a K6-2 if it is a K6-III core with damaged cache. It doesn't mean that didn't happen though...
As I say, for a chip like this that could be either genuine or fake, CPUID is the only way to tell which CPU family it is (ie K6-2 or K6-III). I personally think it far more likely that it is just the wrong carrier used, rather than the wrong cap or a cut-down core.
When you get it, I highly recommend that you test it with something like CPU-Z, when it arrives, so that you can get the CPUID code AND the actual Level 2 cache size. The results of that will make it possible to give a definite answer. Without that info, it is not possible to say YES or NO, as a picture does not tell what something is internally |
They DID do this on a regular basis.
Helped keep profits up.
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debs3759
Joined: 18 Jan 2006
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| Posted: Sun Mar 09, 2008 11:49 am Post subject: |
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That's handy to know. Makes me even more impatient to hear what CPUID says, to know if this was a K6-III with the cache disabled, or a K6-2 in a K6-III carrier
I can't see how selling a K6-III as a K6-2 helped keep profits up though, unless they had LOTS of wafers producing dodgy cache and had to scrape back some of the associated losses (I guess I shouldn't really be too surprised about that though...)
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CPUShack
Joined: 16 Jun 2003
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Location: State of Jefferson, USA
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| Posted: Sun Mar 09, 2008 12:18 pm Post subject: |
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| debs3759 wrote: | That's handy to know. Makes me even more impatient to hear what CPUID says, to know if this was a K6-III with the cache disabled, or a K6-2 in a K6-III carrier
I can't see how selling a K6-III as a K6-2 helped keep profits up though, unless they had LOTS of wafers producing dodgy cache and had to scrape back some of the associated losses (I guess I shouldn't really be too surprised about that though...) |
exactly, ANY time you can recover a flawed die, you are keeping things in the black.
K6-3's had something like a 25% fail rate, so if by reselling them as K6-2's they could recoup around even 50% of that, it supports their bottom line.
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Jedi08
Joined: 03 Mar 2007
Posts: 463
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| Posted: Thu Mar 20, 2008 5:27 pm Post subject: |
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Hi Debs,
here is something for you:
CPUID is not 058C (Chomper-XT), not 0580 (Chomper) and not 0591 (Sharptooth=K6-III). It`s 0589 !?
So model is K6-2, but stepping is 9.
Pictures will follow. It looks genuine, no scratches or marks from removing the heat spreader.
Christian |
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debs3759
Joined: 18 Jan 2006
Posts: 9477
Location: Northampton, Divided Kingdom
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| Posted: Thu Mar 20, 2008 5:58 pm Post subject: |
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Nice! I have not come across 0589 on anything other than IDT Winchip 2A (0587-0589), although my notes also say:
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; 058x Pentium MMX P55C, Mobile
; 058x K6-2(E) any Model 8, 200-550 MHz,64KB L1, 100MHz
; 058x Rise mP6 iDragon II 0.25u, 256K L2 (Rise)
; 058x IDT Winchip C2 any 64K L1, MMX, 3DNow! (samples only) |
It certainly does seem genuine (nobody is likely to fake a common desktop processor from an embedded version that is typically worth more, and none of the non-AMD chips had the same package type), so that must be a very uncommon variant (like the Revision E K6-2/300AFR I have with CPUID 0584, which is also not documented anywhere).
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