VOGONS


First post, by Rikintosh

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I have this damn biostar: https://stason.org/TULARC/pc/motherboards/B/B … Pentiu-211.html

It's not that bad, I like it because it has onboard USB, and onboard ps/2 keyboard connector, but it only manages 200mhz, and I have a 233mhz pentium that I would like to use on it. What could I do? Is there any way I can change the clock generator or something?

Take a look at my retro blog: https://ricardoramosinformatica.blogspot.com/
My Youtube channel: https://www.youtube.com/channel/UCfRUbxkBmEihBEkIK32Hilg

Reply 2 of 23, by Horun

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Yes try the 1.5X mutliplier.
https://www.ultimateretro.net/en/motherboards/1118 is a better page than stasons...

Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor.

Reply 3 of 23, by Repo Man11

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I had one of those and I ran it with a K6-2 450 @ 400 MHz for a while (6x66). But I was playing a game one hot summer night, and I heard a pop and it died. I think the voltage regulator for the CPU overheated and died.

"Everyone is ignorant, only on different subjects." - Will Rogers

Reply 4 of 23, by Sphere478

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Post a clear pic of the clock gen. You may be able to do more than 66mhz bus.

Yes, try 1.5x for the multiplier. The pentium 233 re mapped 1.5 to 3.5

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)

Reply 5 of 23, by Anonymous Coward

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If the board only lists support up to 200MHz, it may not even be able to handle split rail CPUs.
Some people here say it's not a big deal to run PMMX at 3.3-3.5V core voltage. Personally I wouldn't do it.

"Will the highways on the internets become more few?" -Gee Dubya
V'Ger XT|Upgraded AT|Ultimate 386|Super VL/EISA 486|SMP VL/EISA Pentium

Reply 6 of 23, by Sphere478

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Anonymous Coward wrote on 2021-11-14, 05:22:

If the board only lists support up to 200MHz, it may not even be able to handle split rail CPUs.
Some people here say it's not a big deal to run PMMX at 3.3-3.5V core voltage. Personally I wouldn't do it.

Could get a powerleap interposer and a k6 3 or k6 3+

Yeah, I’d never put a split rail cpu in a single rais configuration. Risky

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)

Reply 8 of 23, by Anonymous Coward

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Now I see it way down at the very bottom. Perhaps I got distracted because of all the stupid ads. Stason sucks. Stop using it. There are plenty of other TH99 mirrors, almost all of them are better.

"Will the highways on the internets become more few?" -Gee Dubya
V'Ger XT|Upgraded AT|Ultimate 386|Super VL/EISA 486|SMP VL/EISA Pentium

Reply 9 of 23, by Sphere478

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frudi wrote on 2021-11-14, 08:54:

Both links up there list jumper settings for 2.6 V and 2.9 V, as well as CPU type selection jumpers with settings for P55C (Pentium MMX). So it obviously supports them.

at whom it may interest:
Most socket 7 boards have lower voltage settings if you put in a high boltage voltage chip and play around with a volt meter to the large tab on one of the mosfets and ground

Usually all jumpers removed is the lowest

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)

Reply 10 of 23, by Rikintosh

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Unfortunately my 233mhz processor fell to the ground, and I didn't notice, I ended up running over my computer chair, the pins are all smashed 🙁

I ordered another processor, as soon as it arrives, I will do the test

I have a 166mhz mmx, it was quite popular with overclockers, maybe I play with it a bit, but I really wanted to use the 233mhz to avoid overheating in a baby AT case with poor ventilation

Take a look at my retro blog: https://ricardoramosinformatica.blogspot.com/
My Youtube channel: https://www.youtube.com/channel/UCfRUbxkBmEihBEkIK32Hilg

Reply 11 of 23, by Sphere478

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Rikintosh wrote on 2021-11-14, 23:22:

Unfortunately my 233mhz processor fell to the ground, and I didn't notice, I ended up running over my computer chair, the pins are all smashed 🙁

I ordered another processor, as soon as it arrives, I will do the test

I have a 166mhz mmx, it was quite popular with overclockers, maybe I play with it a bit, but I really wanted to use the 233mhz to avoid overheating in a baby AT case with poor ventilation

😳😱🤢🤮

Well, may as well order a k6 2+ 570 they are on ebay.

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)

Reply 12 of 23, by Rikintosh

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Sphere478 wrote on 2021-11-14, 23:44:
Rikintosh wrote on 2021-11-14, 23:22:

Unfortunately my 233mhz processor fell to the ground, and I didn't notice, I ended up running over my computer chair, the pins are all smashed 🙁

I ordered another processor, as soon as it arrives, I will do the test

I have a 166mhz mmx, it was quite popular with overclockers, maybe I play with it a bit, but I really wanted to use the 233mhz to avoid overheating in a baby AT case with poor ventilation

😳😱🤢🤮

Well, may as well order a k6 2+ 570 they are on ebay.

I already have an AMD k6 build, it even has an AGP slot, I want to build an intel MMX because the case already has one of those metal stickers written intel mmx

Take a look at my retro blog: https://ricardoramosinformatica.blogspot.com/
My Youtube channel: https://www.youtube.com/channel/UCfRUbxkBmEihBEkIK32Hilg

Reply 13 of 23, by Doornkaat

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Sphere478 wrote on 2021-11-14, 23:44:
Rikintosh wrote on 2021-11-14, 23:22:

Unfortunately my 233mhz processor fell to the ground, and I didn't notice, I ended up running over my computer chair, the pins are all smashed 🙁

I ordered another processor, as soon as it arrives, I will do the test

I have a 166mhz mmx, it was quite popular with overclockers, maybe I play with it a bit, but I really wanted to use the 233mhz to avoid overheating in a baby AT case with poor ventilation

😳😱🤢🤮

Well, may as well order a k6 2+ 570 they are on ebay.

I'd be cautious running anything that draws more power current than a P1MMX in this board. The VRM is essentially just two LDOs and they will struggle.
See

Repo Man11 wrote on 2021-11-14, 04:10:

I had one of those and I ran it with a K6-2 450 @ 400 MHz for a while (6x66). But I was playing a game one hot summer night, and I heard a pop and it died. I think the voltage regulator for the CPU overheated and died.

Last edited by Doornkaat on 2021-11-15, 07:27. Edited 1 time in total.

Reply 14 of 23, by Sphere478

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Doornkaat wrote on 2021-11-15, 00:56:
I'd be cautious running anything that draws more power than a P1MMX in this board. The VRM is essentially just two LDOs and they […]
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Sphere478 wrote on 2021-11-14, 23:44:
Rikintosh wrote on 2021-11-14, 23:22:

Unfortunately my 233mhz processor fell to the ground, and I didn't notice, I ended up running over my computer chair, the pins are all smashed 🙁

I ordered another processor, as soon as it arrives, I will do the test

I have a 166mhz mmx, it was quite popular with overclockers, maybe I play with it a bit, but I really wanted to use the 233mhz to avoid overheating in a baby AT case with poor ventilation

😳😱🤢🤮

Well, may as well order a k6 2+ 570 they are on ebay.

I'd be cautious running anything that draws more power than a P1MMX in this board. The VRM is essentially just two LDOs and they will struggle.
See

Repo Man11 wrote on 2021-11-14, 04:10:

I had one of those and I ran it with a K6-2 450 @ 400 MHz for a while (6x66). But I was playing a game one hot summer night, and I heard a pop and it died. I think the voltage regulator for the CPU overheated and died.

K6 + cpus use very little power. So little you can passively cool them sometimes.

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)

Reply 15 of 23, by rmay635703

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Sphere478 wrote on 2021-11-14, 19:46:
at whom it may interest: Most socket 7 boards have lower voltage settings if you put in a high boltage voltage chip and play aro […]
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frudi wrote on 2021-11-14, 08:54:

Both links up there list jumper settings for 2.6 V and 2.9 V, as well as CPU type selection jumpers with settings for P55C (Pentium MMX). So it obviously supports them.

at whom it may interest:
Most socket 7 boards have lower voltage settings if you put in a high boltage voltage chip and play around with a volt meter to the large tab on one of the mosfets and ground

Usually all jumpers removed is the lowest

Many boards aren’t dual plane and lack the second regulator

Fun hack is to mod your socket 5 VIO itself for 2.9-3.1 volts and then your PMMX shouldn’t flame up if the board remains stable.

Reply 16 of 23, by Sphere478

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rmay635703 wrote on 2021-11-15, 02:09:
Sphere478 wrote on 2021-11-14, 19:46:
at whom it may interest: Most socket 7 boards have lower voltage settings if you put in a high boltage voltage chip and play aro […]
Show full quote
frudi wrote on 2021-11-14, 08:54:

Both links up there list jumper settings for 2.6 V and 2.9 V, as well as CPU type selection jumpers with settings for P55C (Pentium MMX). So it obviously supports them.

at whom it may interest:
Most socket 7 boards have lower voltage settings if you put in a high boltage voltage chip and play around with a volt meter to the large tab on one of the mosfets and ground

Usually all jumpers removed is the lowest

Many boards aren’t dual plane and lack the second regulator

Fun hack is to mod your socket 5 VIO itself for 2.9-3.1 volts and then your PMMX shouldn’t flame up if the board remains stable.

Yeah there is a little bit of a grey area between socket 7 and 5 🤣. I mean true dual voltage socket 7 boards.

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)

Reply 17 of 23, by Repo Man11

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The TX chipset MB8500TTD has the same issue, so Feipoa added a small fan to cool the VRM when running a K6-2+. Re: mb-8500ttd manual needed

"Everyone is ignorant, only on different subjects." - Will Rogers

Reply 18 of 23, by Rikintosh

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I noticed that the vrm heatsinks didn't have thermal compound of any kind, so I took the heatsinks apart and added some generic thermal compound, I think this did good.

I believe that VRM doesn't need a fan if the CPU cooler is blowing air to the sides. In the case of Feipoa, I think the VRMs were overheating because a heatsink with horizontal fins was used, which prevented the air blown by the fan from reaching the VRM's heatsinks. Although a fan is always good, the downside is noise and one more part that will wear out over time.

Take a look at my retro blog: https://ricardoramosinformatica.blogspot.com/
My Youtube channel: https://www.youtube.com/channel/UCfRUbxkBmEihBEkIK32Hilg

Reply 19 of 23, by Sphere478

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Repo Man11 wrote on 2021-11-15, 04:17:

The TX chipset MB8500TTD has the same issue, so Feipoa added a small fan to cool the VRM when running a K6-2+. Re: mb-8500ttd manual needed

Are you saying that the lower voltage makes the regulators hotter despite the k6 + processors themselves using less watts than other processor types?

🤔 makes sense, higher the voltage difference between input and output the more conversion heat is produced. I see this on my solar controllers. But that’s a difference of nearly 100v didn’t think a 1v difference would be that bad.

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)