VOGONS


K6-2P Mobile CPUs

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First post, by appiah4

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What exactly is different about these CPUs from their desktop parts? Checking Wikipedia, it seems the K6-2P/366AFK is a 16W part whereas the K6-2/366AFR is a 20.8W part despite both running at the same voltage, FSB and multiplier. They also seem to have the same core produced at the some process node but have different CPUIDs (580 vs 58C). The only difference I can see is that the Mobile part actually has a Halt energy saving state whereas the desktop part only has Stop Clock state? Is the difference only power management related? And ultimately, do the K6-2P mobile CPUs work fine in Socket 7 motherboards?

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Reply 1 of 30, by Jasin Natael

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I'm curious as well. I seem to remember using a 366afk once in a desktop board, but I'm not sure if it was a mobile variant or not.
I just remember the model, and I could be remembering incorrectly.

Reply 2 of 30, by rmay635703

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From what I was told the mobile chips are normally extra-ordinary examples found during normal production and got specially binned .

Back in the day (1999-2003) I almost always bought mobile k6-2’s because they tended to be cheap and the lower voltage examples would massively overclock at stock desktop voltage. Just make sure your getting a socket 7 cpu.

The k6-2 (all versions) were tested and binned to an extreme level far beyond what was typical to extract as many speed/temperature grades as possible.
I’m told only 1 out of 20 chips would pass at 550mhz

Reply 3 of 30, by cyclone3d

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I had a regular K6-2 550 back in the day that I had overclocked to 660Mhz on an ASUS P5A.

Never had a mobile version but they sound nice.

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Reply 4 of 30, by BitWrangler

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Is it necessarily true they were same voltage? F denotes a range from 2.1 to 2.3 I would have expected Mobile to be 2.1 at highest and desktop to be 2.2 at lowest.

I do remember that in the late '98 to 2001 timeframe that 550Mhz parts of either K6-2 or K6-3 were really hard to get hold of, most of the time stores only seemed to have 450Mhz in stock. I mean you can call me a liar by bringing up archive.org pages to prove web stores listed them for sale, or google books saved magazine ads, but if you were to actually attempt an order, most of the time you would be unlucky.

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Reply 5 of 30, by cyclone3d

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I worked at a local computer store at the time and we always had plenty of the K6-2 550 CPUs in stock. Got a good employee discount as well.

Yamaha YMF modified setupds and drivers
Yamaha XG resource repository - updated November 27, 2018
Yamaha YMF7x4 Guide
AW744L II - YMF744 - AOpen Cobra Sound Card - Install SB-Link Header

Reply 6 of 30, by BitWrangler

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Well, one thing is for certain then... I never phoned you guys 🤣

Unicorn herding operations are proceeding, but all the totes of hens teeth and barrels of rocking horse poop give them plenty of hiding spots.

Reply 7 of 30, by rmay635703

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I had Mobile chips (normal k6-2 )with voltages as low as 1.6 volts with 333mhz as the speed

Up voltage to 2.2 volts and 400-500mhz was not uncommon and the chip ran no hotter than a normal desktop chip

AMD didn’t make special chips for mobile k6-2 they just binned examples that ran stable at low voltages

BitWrangler wrote on 2021-12-01, 19:48:

Well, one thing is for certain then... I never phoned you guys 🤣

Try buying a 570mhz k6-2

They were expensive and uncommon back when you would want one, (I had no trouble sourcing 500+ but a 533 was twice the price of a 450)
and then became cheap and plentiful post 2001 when they were too obsolete to bother with.

My solution was to stick with 450mhz k6-2’s or low voltage Mobile examples, that seemed to be the sweet spot and you could OC to 500 if you wanted .

Something strange I could never explain was the sheer number of folks with k6-2 380’s and 475’s
That 95 / 93 / 97 mhz FSB thing never made any sense to me but both my roommates owned one of those oddities, I only owned one motherboard that supported 95mhz but never the other wierd speeds

Wonder what the owner of this site is smoking?
66x8 multiplier bah

https://www.engineering-sample.com/gallery/AM … amily/K62533ES/

Reply 8 of 30, by BitWrangler

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Those weird speeds seemed to be a Compaq thing, for reasons unknown they seemed to have bought a lot, then dumped them on surplus market. I don't know if it was multiple times, but over several years there seemed to be at least 3 "floods" of them. If you got new tray CPUs they had a compaq PN on, but there was also a white box "boxed" version with compaq PN, CPU inside on a plastic tray, with a tall pinned passive heatsink.

Unicorn herding operations are proceeding, but all the totes of hens teeth and barrels of rocking horse poop give them plenty of hiding spots.

Reply 9 of 30, by appiah4

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The only K6-2P I have is the 366 and it is 2.2V just like its desktop counterpart. Maybe it can OC like a beast or something I don't know but I never tried it in a board to be honest.

Retronautics: A digital gallery of my retro computers, hardware and projects.

Reply 10 of 30, by rmay635703

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My friends with all the odd speed k6-2’s seemed to have been early adopters of the k6-2, there were times (early) where the 380 was a full $50 cheaper than a k6-2 400, my roommate overclock Ed it to 400 not long after purchase.

appiah4 wrote on 2021-12-01, 20:48:

The only K6-2P I have is the 366 and it is 2.2V just like its desktop counterpart. Maybe it can OC like a beast or something I don't know but I never tried it in a board to be honest.

Check the full code on the chip, it is likely rated with a high case temperature and lower wattage.
Should go 400mhz without touching the voltage 450 or even 500 if you crank it up to 2.4/2.5 volts but would need to test it, some mobile k6-2 (not 2+) go straight to 500mhz without touching voltage, others despite the very low voltage (1.6/1.8v) only go to 400 and voltage doesn’t much matter.

Reply 11 of 30, by appiah4

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rmay635703 wrote on 2021-12-01, 22:14:
appiah4 wrote on 2021-12-01, 20:48:

The only K6-2P I have is the 366 and it is 2.2V just like its desktop counterpart. Maybe it can OC like a beast or something I don't know but I never tried it in a board to be honest.

Check the full code on the chip, it is likely rated with a high case temperature and lower wattage.
Should go 400mhz without touching the voltage 450 or even 500 if you crank it up to 2.4/2.5 volts but would need to test it, some mobile k6-2 (not 2+) go straight to 500mhz without touching voltage, others despite the very low voltage (1.6/1.8v) only go to 400 and voltage doesn’t much matter.

AMD-K6-2-P-366-AFK.jpg

Seems to be 2.2V to me.

Retronautics: A digital gallery of my retro computers, hardware and projects.

Reply 12 of 30, by Tetrium

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appiah4 wrote on 2021-12-01, 22:35:
https://i.postimg.cc/vBdq3x0k/AMD-K6-2-P-366-AFK.jpg […]
Show full quote
rmay635703 wrote on 2021-12-01, 22:14:
appiah4 wrote on 2021-12-01, 20:48:

The only K6-2P I have is the 366 and it is 2.2V just like its desktop counterpart. Maybe it can OC like a beast or something I don't know but I never tried it in a board to be honest.

Check the full code on the chip, it is likely rated with a high case temperature and lower wattage.
Should go 400mhz without touching the voltage 450 or even 500 if you crank it up to 2.4/2.5 volts but would need to test it, some mobile k6-2 (not 2+) go straight to 500mhz without touching voltage, others despite the very low voltage (1.6/1.8v) only go to 400 and voltage doesn’t much matter.

AMD-K6-2-P-366-AFK.jpg

Seems to be 2.2V to me.

Case temperature is 80°C
Kinda weird the K6-2P has the same part number as the desktop K6-2
This page I like for this https://www.cpu-world.com/info/id/AMD-K6-identification.html

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Reply 13 of 30, by appiah4

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Having the same part numer is probably because it works as a drop in replacement for desktop CPUs? I mean, if I use this in a desktop Socket 7 board it should work fine, right?

Retronautics: A digital gallery of my retro computers, hardware and projects.

Reply 14 of 30, by Sphere478

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rmay635703 wrote on 2021-12-01, 19:49:
I had Mobile chips (normal k6-2 )with voltages as low as 1.6 volts with 333mhz as the speed […]
Show full quote

I had Mobile chips (normal k6-2 )with voltages as low as 1.6 volts with 333mhz as the speed

Up voltage to 2.2 volts and 400-500mhz was not uncommon and the chip ran no hotter than a normal desktop chip

AMD didn’t make special chips for mobile k6-2 they just binned examples that ran stable at low voltages

BitWrangler wrote on 2021-12-01, 19:48:

Well, one thing is for certain then... I never phoned you guys 🤣

Try buying a 570mhz k6-2

They were expensive and uncommon back when you would want one, (I had no trouble sourcing 500+ but a 533 was twice the price of a 450)
and then became cheap and plentiful post 2001 when they were too obsolete to bother with.

My solution was to stick with 450mhz k6-2’s or low voltage Mobile examples, that seemed to be the sweet spot and you could OC to 500 if you wanted .

Something strange I could never explain was the sheer number of folks with k6-2 380’s and 475’s
That 95 / 93 / 97 mhz FSB thing never made any sense to me but both my roommates owned one of those oddities, I only owned one motherboard that supported 95mhz but never the other wierd speeds

Wonder what the owner of this site is smoking?
66x8 multiplier bah

https://www.engineering-sample.com/gallery/AM … amily/K62533ES/

Aren’t those 5.5x95?

Btw, there are k6 2+ 570 chips for sale on ebay some dude has like thousands of them.

I’m not aware of any socket 7 amd chips that didn’t work in socket 7

The only one I can think of is cyrix media gx

K6 plus cpus usually work in most socket 7 boards, but many require bios mods to work better. (See jan’s website) often you also have to figure out the undocumented voltage settings.

Tetrium wrote on 2021-12-02, 07:17:
Case temperature is 80°C Kinda weird the K6-2P has the same part number as the desktop K6-2 This page I like for this https://ww […]
Show full quote
appiah4 wrote on 2021-12-01, 22:35:
https://i.postimg.cc/vBdq3x0k/AMD-K6-2-P-366-AFK.jpg […]
Show full quote
rmay635703 wrote on 2021-12-01, 22:14:

Check the full code on the chip, it is likely rated with a high case temperature and lower wattage.
Should go 400mhz without touching the voltage 450 or even 500 if you crank it up to 2.4/2.5 volts but would need to test it, some mobile k6-2 (not 2+) go straight to 500mhz without touching voltage, others despite the very low voltage (1.6/1.8v) only go to 400 and voltage doesn’t much matter.

AMD-K6-2-P-366-AFK.jpg

Seems to be 2.2V to me.

Case temperature is 80°C
Kinda weird the K6-2P has the same part number as the desktop K6-2
This page I like for this https://www.cpu-world.com/info/id/AMD-K6-identification.html

I keep looking around for a P or E marking on the chip name but can never seem to find one, even on my mobile + chips, what am I missing…? Does it show in cpuz?

Sphere's PCB projects.
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Sphere’s socket 5/7 cpu collection.
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SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
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Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)

Reply 15 of 30, by BitWrangler

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Sphere478 wrote on 2021-12-02, 08:55:

Btw, there are k6 2+ 570 chips for sale on ebay some dude has like thousands of them.

Ooooo, thanks for the tip, I was looking around a few months ago, there seemed to be warehouses full of that part being held by the industrial controls supply industry, guess the floodgates finally burst. I may have skipped over them at the price listed not realizing it was for LOTS OF THREE. IDK whether to get 3 or 6 now 🤣

Hmmm if I get 3 I'll only want to use 2 and hold one in reserve, and I am sure I can use 3 right off...

Unicorn herding operations are proceeding, but all the totes of hens teeth and barrels of rocking horse poop give them plenty of hiding spots.

Reply 16 of 30, by Tetrium

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appiah4 wrote on 2021-12-02, 07:48:

Having the same part numer is probably because it works as a drop in replacement for desktop CPUs? I mean, if I use this in a desktop Socket 7 board it should work fine, right?

I don't know. It's possible, but I just don't know.

Sphere478 wrote on 2021-12-02, 08:55:
Aren’t those 5.5x95? […]
Show full quote
rmay635703 wrote on 2021-12-01, 19:49:
I had Mobile chips (normal k6-2 )with voltages as low as 1.6 volts with 333mhz as the speed […]
Show full quote

I had Mobile chips (normal k6-2 )with voltages as low as 1.6 volts with 333mhz as the speed

Up voltage to 2.2 volts and 400-500mhz was not uncommon and the chip ran no hotter than a normal desktop chip

AMD didn’t make special chips for mobile k6-2 they just binned examples that ran stable at low voltages

BitWrangler wrote on 2021-12-01, 19:48:

Well, one thing is for certain then... I never phoned you guys 🤣

Try buying a 570mhz k6-2

They were expensive and uncommon back when you would want one, (I had no trouble sourcing 500+ but a 533 was twice the price of a 450)
and then became cheap and plentiful post 2001 when they were too obsolete to bother with.

My solution was to stick with 450mhz k6-2’s or low voltage Mobile examples, that seemed to be the sweet spot and you could OC to 500 if you wanted .

Something strange I could never explain was the sheer number of folks with k6-2 380’s and 475’s
That 95 / 93 / 97 mhz FSB thing never made any sense to me but both my roommates owned one of those oddities, I only owned one motherboard that supported 95mhz but never the other wierd speeds

Wonder what the owner of this site is smoking?
66x8 multiplier bah

https://www.engineering-sample.com/gallery/AM … amily/K62533ES/

Aren’t those 5.5x95?

Btw, there are k6 2+ 570 chips for sale on ebay some dude has like thousands of them.

I’m not aware of any socket 7 amd chips that didn’t work in socket 7

The only one I can think of is cyrix media gx

K6 plus cpus usually work in most socket 7 boards, but many require bios mods to work better. (See jan’s website) often you also have to figure out the undocumented voltage settings.

Tetrium wrote on 2021-12-02, 07:17:
Case temperature is 80°C Kinda weird the K6-2P has the same part number as the desktop K6-2 This page I like for this https://ww […]
Show full quote
appiah4 wrote on 2021-12-01, 22:35:
https://i.postimg.cc/vBdq3x0k/AMD-K6-2-P-366-AFK.jpg […]
Show full quote

AMD-K6-2-P-366-AFK.jpg

Seems to be 2.2V to me.

Case temperature is 80°C
Kinda weird the K6-2P has the same part number as the desktop K6-2
This page I like for this https://www.cpu-world.com/info/id/AMD-K6-identification.html

I keep looking around for a P or E marking on the chip name but can never seem to find one, even on my mobile + chips, what am I missing…? Does it show in cpuz?

These don't have those markings, which is rather confusing.
Perhaps these were simply never sold in retail channels so the lack of obvious distinguishable part numbers was simply not an issue.

Whats missing in your collections?
My retro rigs (old topic)
Interesting Vogons threads (links to Vogonswiki)
Report spammers here!

Reply 17 of 30, by Namrok

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Huh, I too will thank you for the heads up about that k6 2+ 570. Looks like it runs at 95x6? How many SS7 mobos even do a 6x multiplier? Looks like mine only goes up to 5.5. Or does that model of the K6-2 do the usual thing where the 2x multiplier is actually 6x for it?

I wonder if my humble PC Partner MVP3 board could handle it at 100x6.

Win95/DOS 7.1 - P233 MMX (@2.5 x 100 FSB), Diamond Viper V330 AGP, SB16 CT2800
Win98 - K6-2+ 500, GF2 MX, SB AWE 64 CT4500, SBLive CT4780
Win98 - Pentium III 1000, GF2 GTS, SBLive CT4760
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Reply 18 of 30, by BitWrangler

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MVP3 are usually good for quite a bit.

I wanna get to the bottom of the table here...

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Unicorn herding operations are proceeding, but all the totes of hens teeth and barrels of rocking horse poop give them plenty of hiding spots.

Reply 19 of 30, by Sphere478

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Namrok wrote on 2021-12-02, 15:01:

Huh, I too will thank you for the heads up about that k6 2+ 570. Looks like it runs at 95x6? How many SS7 mobos even do a 6x multiplier? Looks like mine only goes up to 5.5. Or does that model of the K6-2 do the usual thing where the 2x multiplier is actually 6x for it?

I wonder if my humble PC Partner MVP3 board could handle it at 100x6.

Yeah, just set 2x

If the board is ss7 and working properly it should work fine at 100

The cpu may or may not do 6x100 but if it doesn’t that would be unusual. Usually those are good for 570-630 on air at least. most will do 600

The 570 is a cool chip to own, but any old k6-3+ of any speed is probably a better buy as it has twice the cache. So check for those also. My understanding is any + cpu usually will do 600mhz or so. They were all .18um process which differed from the previous non plus of .25um If memory is serving.

BitWrangler wrote on 2021-12-02, 15:43:

MVP3 are usually good for quite a bit.

I wanna get to the bottom of the table here...

I have a mvp3 board and it has a tonne of stability problems dono if it’s typical or something wrong with mine but at the very least the memory controller is horrible.

Ali makes a far superior memory controller it seems. I can’t understate how much better the ali memory controller is.. like 50% more throuput and better timings and support for more mb there is a user on here that got 1.5gb working on a ali

Sphere's PCB projects.
-
Sphere’s socket 5/7 cpu collection.
-
SUCCESSFUL K6-2+ to K6-3+ Full Cache Enable Mod
-
Tyan S1564S to S1564D single to dual processor conversion (also s1563 and s1562)