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xsecret
Joined: 01 Feb 2004
Posts: 1846
Location: France
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 Posted: Sat Apr 25, 2020 11:13 am Post subject: [UCA] ES/Unusual CPU Analysis Thread - Updated 2020-05-25 |
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I will post here all ES/Rare/Unusual CPUs analyzed with the Universal Chip Analyzer.
-> [2020-04-25] Fake Am486DX4-100V16BGI
-> [2020-05-11] Intel 486 DX2-66 SYE36 ES
-> [2020-05-16] Blank AMD & IT'S ST/Cyrix 486s
-> [2020-05-25] UMC Green CPU U5S-SUPER33 ES
->
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Last edited by xsecret on Mon May 25, 2020 6:42 am; edited 4 times in total |
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xsecret
Joined: 01 Feb 2004
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Neon
Joined: 04 Feb 2008
Posts: 1512
Location: Dallas, Texas, USA
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| Posted: Sat Apr 25, 2020 12:34 pm Post subject: |
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Thank you for this. I agree with your analysis - the date code is much too recent for package 25253. The mis-spelling clinches the conclusion that it is fake.
I have an identical-looking fake sample, and would like to confirm your finding after I can get a UCA. |
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frag_
Joined: 17 Nov 2008
Posts: 4015
Location: Estonia
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| Posted: Sat Apr 25, 2020 12:39 pm Post subject: |
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I also have one with exactly the same datecode, bought in Russia, it's desoldered.
So they are quite widespread. |
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Guest
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| Posted: Sun Apr 26, 2020 2:56 am Post subject: |
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As far as I know, the only 486-class CPU from AMD with 16KB L1 cache was 5x86 (or 486 DX5 as it was also named).
So there are not (or should not be) any other 486-class CPU from AMD with 16KB L1 cache.
Intel had 16KB L1 cache in its last gen 486-class processor, the DX4. |
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Elar
Joined: 16 Jul 2003
Posts: 746
Location: Tallinn, Estonia
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| Posted: Sun Apr 26, 2020 4:35 am Post subject: |
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| Anonymous wrote: | As far as I know, the only 486-class CPU from AMD with 16KB L1 cache was 5x86 (or 486 DX5 as it was also named).
So there are not (or should not be) any other 486-class CPU from AMD with 16KB L1 cache.
Intel had 16KB L1 cache in its last gen 486-class processor, the DX4. |
AMD datasheet https://en.wikichip.org/w/images/1/13/AMD_Enhanced_Am486_%28March%2C_1997%29.pdf disagrees with you. There was also DX2-66 and DX4-100 with 16KB write-back cache. |
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Andreycpu
Joined: 13 Feb 2016
Posts: 1216
Location: Russia
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| Posted: Sun Apr 26, 2020 6:19 am Post subject: |
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I have exactly the same, it is soldered.
He will be fake too? |
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Wasmachineman_NL
Joined: 04 Jul 2019
Posts: 988
Location: Netherlands
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| Posted: Sun Apr 26, 2020 8:06 am Post subject: |
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| Andreycpu wrote: | I have exactly the same, it is soldered.
He will be fake too? |
Definitely a fake, CompaTTble and non-grided AMD logo. |
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xsecret
Joined: 01 Feb 2004
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Location: France
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Neology
Joined: 25 May 2011
Posts: 2412
Location: VIC, AU
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| Posted: Sun Apr 26, 2020 9:24 am Post subject: |
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From the UCA software interface, it displays as DX4-100 V8T, but the reference photo is a DX4-100SV8B..... I guess it is a bug? 
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xsecret
Joined: 01 Feb 2004
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Neology
Joined: 25 May 2011
Posts: 2412
Location: VIC, AU
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| Posted: Sun Apr 26, 2020 10:47 am Post subject: |
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On the fake one, by looking at the "windows compatible sign", the print looks too smooth.
Looking at all my AMD 486 100MHz, It should look pixelized...
Now, I am looking forward the UCA production and will be interested to test out all my collection to see what they really are 
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Last edited by Neology on Sun Apr 26, 2020 11:00 am; edited 1 time in total |
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xsecret
Joined: 01 Feb 2004
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ph4nt0m
Joined: 01 Jan 2018
Posts: 812
Location: Europe
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| Posted: Sun Apr 26, 2020 4:41 pm Post subject: Re: Fake Am486DX4-100V16BGI |
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| xsecret wrote: | As an avid ES collector, it's tempting to start with an ES, but the first CPU that really benefited from the UCA is a Am486DX4 I found while adding support for AMD 486s.
These CPUs are still selling on eBay for quite high price right now but I just found they are fake. Actually early remarked Am486DX4-100 V8T with only 8 KB L1 cache and no write-back.
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Real V16BGI is package number 25544, not 25253
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xsecret
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