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CPUShack
Joined: 16 Jun 2003
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Location: State of Jefferson, USA
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max1024
Joined: 15 Jan 2015
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Location: Belarus
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 Posted: Fri Aug 13, 2021 1:29 am Post subject: |
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Thanks here aaronkatrini for quality photos of B52 CPU  Without them it was impossible to make an article  |
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rjluna2
Joined: 27 Oct 2014
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Location: Hiram, GA, USA
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| Posted: Fri Aug 13, 2021 6:51 am Post subject: |
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| Nice backstory on the Italian microprocessor |
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H3nrik V!
Joined: 15 Apr 2014
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Location: Denmark
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| Posted: Fri Aug 13, 2021 8:03 am Post subject: |
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Nice stuff!
You might wanna mention, that the colors in the B52 logo, are the colors of the Italian flag (not surprising)
Further more, I recall having read somewhere that lower clocked PIIs (and Katmais) tend to have less wait states/latency (or something like that) on the cache. This could explain why the B52@450 was faster than PII@450. This might be verified by testing a Deschutes-300 up against a Deschutes-450 downclocked to 300 (as overclocking the 300 might prove hard) .. |
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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| Posted: Fri Aug 13, 2021 8:16 pm Post subject: |
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| H3nrik V! wrote: | Nice stuff!
You might wanna mention, that the colors in the B52 logo, are the colors of the Italian flag (not surprising)
Further more, I recall having read somewhere that lower clocked PIIs (and Katmais) tend to have less wait states/latency (or something like that) on the cache. This could explain why the B52@450 was faster than PII@450. This might be verified by testing a Deschutes-300 up against a Deschutes-450 downclocked to 300 (as overclocking the 300 might prove hard) .. |
Added a bit about the Italian flag
The later version of the cache tag on the 300s they used maybe helped too
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H3nrik V!
Joined: 15 Apr 2014
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Location: Denmark
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| Posted: Mon Aug 16, 2021 8:47 am Post subject: |
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This article outlines some stuff about latency on L2 Cache on Pentium II
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The BIOS can tell a right PII 450 from an overclocked PII 300 SL2W8, even if the L2 cache chips and the L2 cache controller are the same, and it initializes a PII 450 completely different to an overclocked SL2W8. So does a PII 450 give you a L2 cache latency of '8' and a latency mode '02', whilst a SL2W8 at 450 MHZ with the very same external chips gives you a latency of '3' and a latency mode of '00'.
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https://www.tomshardware.com/reviews/overclocking-special,94-3.html |
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