Cyrix appreciation thread

Discussion about old PC hardware.

Re: Cyrix appreciation thread

Postby sliderider » 2012-12-24 @ 19:40

bump for above post.
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Re: Cyrix appreciation thread

Postby Tetrium » 2012-12-24 @ 21:51

sliderider wrote:Is there a difference between a 6x86MX PR300 and an MII PR300?

I don't know for sure, but afaik the MII was just a renamed 6x86MX to make it sound more like it was in the same tier as Pentium 2. The PR system remained the same I believe.
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Re: Cyrix appreciation thread

Postby feipoa » 2012-12-24 @ 22:18

sliderider wrote:Is there a difference between a 6x86MX PR300 and an MII PR300?

Off the top of my head, it seems like there were a few minor changes somewhere along the MX-to-MII line. Did you read through all the Cyrix literature found here, http://datasheets.chipdb.org/Cyrix/
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Re: Cyrix appreciation thread

Postby sliderider » 2012-12-24 @ 22:27

feipoa wrote:
sliderider wrote:Is there a difference between a 6x86MX PR300 and an MII PR300?

Off the top of my head, it seems like there were a few minor changes somewhere along the MX-to-MII line. Did you read through all the Cyrix literature found here, http://datasheets.chipdb.org/Cyrix/


No, and I'm not about to. If there isn't a chart somewhere comparing the two chips side by side, I'm not going through all that literature trying to find any differences.
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Re: Cyrix appreciation thread

Postby mwdmeyer » 2015-2-19 @ 13:05

Thought I would bump this thread, just purchased a Cyrix 486 DX/2 50. Getting it soon :)
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Re: Cyrix appreciation thread

Postby vetz » 2015-2-19 @ 13:39

Heh, I'm also joining the club.

Got myself a Cyrix 5x86 120GP for 10 dollars :)
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Re: Cyrix appreciation thread

Postby tayyare » 2015-2-19 @ 15:03

I don't have any noticeable Cyrix chips on hand at the moment (apart from an IBM 486 and a Cyrix 387 FPU) but I had them in the past. My first 486 was a Cyrix DX33 and the last one was a 5x86 100 (overclocked to 120 by mistake, for all its life). This one was a very handsome chip with its green heat sink (and no fan), and easily outperforming then common Intel/AMD DX4-100s.
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Re: Cyrix appreciation thread

Postby Artex » 2015-2-19 @ 15:21

Added another to my collection...

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Re: Cyrix appreciation thread

Postby Sutekh94 » 2015-2-19 @ 15:44

Only Cyrix-based anything that I've got on hand is my MediaGX-based Compaq Presario 2200. I'd love to get a hold of a 6x86 or something among those lines one day.
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Re: Cyrix appreciation thread

Postby feipoa » 2015-2-19 @ 18:35

Artex, could you also show an image of the bottom of that CPU?
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Re: Cyrix appreciation thread

Postby Artex » 2015-2-19 @ 19:13

feipoa wrote:Artex, could you also show an image of the bottom of that CPU?


Image

I originally posted here, since I'm unsure of the date of manufacture.

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Re: Cyrix appreciation thread

Postby feipoa » 2015-2-19 @ 19:35

40th week of 1995
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Re: Cyrix appreciation thread

Postby Artex » 2015-2-19 @ 19:37

feipoa wrote:40th week of 1995


How did you derive that?
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Re: Cyrix appreciation thread

Postby feipoa » 2015-2-19 @ 19:41

Past internet research now embedded into my brain.
P=1995
Q=1996
40 = 40th week.

CPUshack's website has some disection information of Cyrix CPU markings.
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Re: Cyrix appreciation thread

Postby Artex » 2015-2-19 @ 19:46

feipoa wrote:Past internet research now embedded into my brain.
P=1995
Q=1996
40 = 40th week.

CPUshack's website has some disection information of Cyrix CPU markings.

Perfect! Thanks! Just out of curiosity, why did you wanna see the bottom? Were you hoping for a later-dated chip that could possibly do 133Mhz?
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Re: Cyrix appreciation thread

Postby feipoa » 2015-2-19 @ 20:31

I was only wanting to determine how deep into 1995 your -100HB CPU went. The heatsinks with -100HF are the newer ones.

Since you inquired about 133 MHz operation, I now have 4 IBM 5x86c chips which run stable at 133 MHz, but they all are from week 50, 1995 or newer. I tested about a half-dozen chips from before this datecode and they all failed. 3.75 V seems to be the sweet spot, however I have an unconfirmed hypothesis that this voltage requirement may be related to some kind of chipset-CPU current relationship. It seems too coincidental that all 4 chips wanted exactly 3.750 V to pass all my grueling stability tests.

Note for those reading this: just because your IBM 5x86c has a datecode newer than or equal to Week 50, 1995 does not guarantee it will operate well at 133 MHz. I have run into chips from weeks 12-38 of 1996 which failed at 133 MHz.
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Re: Cyrix appreciation thread

Postby Artex » 2015-2-19 @ 20:34

feipoa wrote:I was only wanting to determine how deep into 1995 your -100HB CPU went. The heatsinks with -100HF are the newer ones.

Since you inquired about 133 MHz operation, I now have 4 IBM 5x86c chips which run stable at 133 MHz, but they all are from week 50, 1995 or newer. I tested about a half-dozen chips from before this datecode and they all failed. 3.75 V seems to be the sweet spot, however I have an unconfirmed hypothesis that this voltage requirement may be related to some kind of chipset-CPU current relationship. It seems too coincidental that all 4 chips wanted exactly 3.750 V to pass all my grueling stability tests.


Gotcha. Interesting findings as well with that voltage requirement @ 133Mhz.
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Re: Cyrix appreciation thread

Postby sliderider » 2015-2-20 @ 00:26

Image

My last Cyrix find was two of these, and no they weren't the two that were in that scrap gold lot recently. I bought my two from two different sellers about 2 months before that scrap lot came up for sale. I wouldn't have posted it here if I didn't already have two of those 2.2v 400GP's.
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Re: Cyrix appreciation thread

Postby feipoa » 2015-2-20 @ 00:35

My last Cyrix find was my second Cyrix 5x86-133/4x. The only other Cyrix desire I now have is a working Joshua unit.
EDIT: Actually, a GXM-300 MHz is also desired.
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Re: Cyrix appreciation thread

Postby Gamecollector » 2015-2-20 @ 15:21

By the way have Cyrix released an 90 MHz CPU? IIRC there was an engineering sample with 90x3 speed. Well, they have exclusive CPUs for 40 and 55 MHz FSBs (6x86-P90+ and P133+), they invented 75 and 83.3 MHz. Why not add another exclusive CPU? :)
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