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gshv
Joined: 01 Feb 2003
Posts: 7898
Location: Fairfax, VA USA
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 Posted: Thu Feb 09, 2012 9:21 pm Post subject: Fake Pentium Pro |
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I recently found my first fake Pentium Pro:
I haven't tried to remove coating yet.
Gennadiy |
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Neon_WA
Joined: 08 Nov 2008
Posts: 7146
Location: Margaret River, West Australia
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| Posted: Thu Feb 09, 2012 9:39 pm Post subject: |
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one of the better recoat jobs I have seen done on a Pro 
most likely a SL22S or SL22U
the colour difference between top & bottom ceramic is the first sign I look for
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Redeyeburn
Joined: 27 Jan 2012
Posts: 179
Location: Edmonton, AB, Canada.
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| Posted: Fri Feb 10, 2012 1:01 am Post subject: |
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I have an SL22V too! What are we looking at here that determines it's a fake?
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susl45
Joined: 27 Dec 2007
Posts: 3179
Location: CHU
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| Posted: Fri Feb 10, 2012 2:37 am Post subject: |
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| Redeyeburn wrote: | | I have an SL22V too! What are we looking at here that determines it's a fake? |
As Neon_WA said
| Quote: | | the colour difference between top & bottom ceramic |
and also the marking of characters are a bit different from the official ones.
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Neon_WA
Joined: 08 Nov 2008
Posts: 7146
Location: Margaret River, West Australia
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| Posted: Fri Feb 10, 2012 3:28 am Post subject: |
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these might show you the differences between the font on a real Pentium Pro & one that has been coated & remarked
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Marcin
Joined: 02 Jan 2005
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Location: Poland
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Katmai500
Joined: 30 Sep 2010
Posts: 360
Location: Southern NJ, USA
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| Posted: Fri Feb 10, 2012 10:18 am Post subject: |
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Seems to me like a bonus considering that 200MHz PPros are way easier to find than 166MHz PPros nowadays.  |
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Redeyeburn
Joined: 27 Jan 2012
Posts: 179
Location: Edmonton, AB, Canada.
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| Posted: Fri Feb 10, 2012 3:02 pm Post subject: |
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| Neon_WA wrote: | | these might show you the differences between the font on a real Pentium Pro & one that has been coated & remarked |
Looks like the characters were actually stamped in pretty deep, and a bad black ink job, after the characters were moved to the right.
And the purple coating overlaps some of the gold around the black box up top where it doesn't on the real one.
Mine has the characters in the same position as the fake (as per the above pictures), but they look like the characters in the real pic, and the colors on top & bottom match. The character shift on mine must just be that way from the factory!...or a different factory I suppose.
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Neon_WA
Joined: 08 Nov 2008
Posts: 7146
Location: Margaret River, West Australia
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| Posted: Fri Feb 10, 2012 7:58 pm Post subject: |
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| Redeyeburn wrote: | | Mine has the characters in the same position as the fake |
Placement has little bearing.. there are examples of both real Pentiums & Pros with markings nearly off the chip or at angle
other thing that you can use to pick them.. especially in a scrap lot.. the die cap is painted a darker black.
Hard to pick on its own.. but in a group of real ones.. easy
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gshv
Joined: 01 Feb 2003
Posts: 7898
Location: Fairfax, VA USA
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| Posted: Sun Feb 12, 2012 3:11 pm Post subject: |
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There is one more way to spot fakes. My chip had bottom lid painted, and the lid surface doesn't look as smooth as genuine Pentium Pros. Even worse, whoever painted the lid, didn't clean the surface really well and you can see some dust particles trapped inside the paint:
Gennadiy |
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D.8080
Joined: 03 Apr 2006
Posts: 1474
Location: Italy
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| Posted: Sun Feb 12, 2012 4:31 pm Post subject: |
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| Should be sticky for its content; this is practically a guide. |
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Redeyeburn
Joined: 27 Jan 2012
Posts: 179
Location: Edmonton, AB, Canada.
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| Posted: Mon Feb 13, 2012 1:46 am Post subject: |
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| dume wrote: | | Should be sticky for its content; this is practically a guide. |
Good call!
I don't know if it can be done, but is it possible to take a suspected fake and put it in a working system, then check the rated specs/stampings against the actual specs the suspect chip is running, e.g. MHz?
I don't know much about these chips and what programs were available back in their day to monitor them and their specs, but if there was, then that should be able to pick out a fake pretty easy, unless internal specs can also be permanently altered some how! Assuming someone has access to a working system.
There is a purple C8008 on eBay right now the seller claims was re-stamped by a third party for Intel way back when, maybe these variations in colors and shades Could be the result of a similar situation, or a result of simply being manufactured at a different plant? I'm not trying to question anyone's knowledge or expertise about this, but these are just a few thoughts I had about the subject.
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Neon_WA
Joined: 08 Nov 2008
Posts: 7146
Location: Margaret River, West Australia
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| Posted: Mon Feb 13, 2012 2:05 am Post subject: |
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most fakes/remarks are chips that can overclocked or hacked to alter the multiplier.. so speed doesnt really help
official Intel remarking.. the old marking are normally lasered out and new ones are applied
the C8008s (actually C8008-1s) are likely excess custom or house marked units that some OEM had poorly remarked so they could sell them
Less likely they are units that didnt pass all test requirements that Intel sold on the side to small IC suppliers like godbout
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