PARKE wrote on 2025-04-12, 10:25:

Matt The Cat wrote on 2025-04-11, 12:03:

I think I have seen this, but yeah. My motherboards voltage regulator is designed for 1.8 to 2.8 volts. LX1664CD

According to the spec sheet of the LX1664 it supports the range from 1.3 volt to 3.5 volt.
https://mm.digikey.com/Volume0/opasdata/d2200 … LX1664%2065.pdf

Since the spec sheet includes: Regulation Accuracy 1.8V≤VOUT ≤2.8V

Maybe that just means it garentees accuracy in that range, but can go as low as 1.3

So if I used a slotket with VID to set a tualatin the be read as 1.5 volts. It shouldn't overvolt the CPU or not boot?

Grem Five wrote on 2025-04-12, 16:04:

Matt The Cat wrote on 2025-04-12, 15:56:

PARKE wrote on 2025-04-12, 10:25:

According to the spec sheet of the LX1664 it supports the range from 1.3 volt to 3.5 volt.
https://mm.digikey.com/Volume0/opasdata/d2200 … LX1664%2065.pdf

Weird this page and whatever chatgpt sourced (which may have been this or a similar page) says 1.8 to 2.8? I wonder what's up with that...

https://www.digikey.be/en/products/detail/mic … LX1664CD/701532

I would guess the link you provided is for LX1664CD which is based on LX1664 but not identical in output.

All pages for the LX1664CD use that same spec sheet for reference. So I would guess those details apply to this unit.

Matt The Cat wrote on 2025-04-12, 18:04:

All pages for the LX1664CD use that same spec sheet for reference. So I would guess those details apply to this unit.

I realized that when I actually did a Google search for LX1664CD.

I have tried Tualatin cpus in some of my s370 boards, either they boot or do not but have not hurt a cpu yet..... yet..

Just my personal results.... mileage might vary.

Grem Five wrote on 2025-04-12, 18:52:

I realized that when I actually did a Google search for LX1664CD. […]
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Matt The Cat wrote on 2025-04-12, 18:04:

All pages for the LX1664CD use that same spec sheet for reference. So I would guess those details apply to this unit.

I realized that when I actually did a Google search for LX1664CD.

I have tried Tualatin cpus in some of my s370 boards, either they boot or do not but have not hurt a cpu yet..... yet..

Just my personal results.... mileage might vary.

Thank you. I guess I will test it out if it arrives. And if it doesn't boot, I'll just look into the 1100 celeron coppermine.

IT seems that the pdf's on the web do not represent the earlier CD version - I am sorry for the confusion that I created. Here a description of the CD version:

And there is one for sale on Ebay that also indicates only 1.8v > 3.5v:
https://www.ebay.com/itm/192082568394

PARKE wrote on 2025-04-13, 07:56:

IT seems that the pdf's on the web do not represent the earlier CD version - I am sorry for the confusion that I created. Here […]
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IT seems that the pdf's on the web do not represent the earlier CD version - I am sorry for the confusion that I created. Here a description of the CD version:

Filename

Microsemi Corporation LX1664CD.doc

File size

145 KiB

Downloads

10 downloads

File license

Fair use/fair dealing exception

And there is one for sale on Ebay that also indicates only 1.8v > 3.5v:
https://www.ebay.com/itm/192082568394

Ah ha. I will just have to go with the 1100 coppermine celeron when I can. I also saw that eBay page, but I thought perhaps it only referenced the "Regulation Accuracy1.8V ≤ VOUT≤ 2.8V" on the earlier spec sheet I saw.

I think I will still give it a try. But I'll be careful. This document also references the same data sheet from earlier. It doesn't seem that definitive. But maybe I'm wrong.

Also, I did use chatgpt, so forgive me if I shouldn't, and it mentioned the CD meant:

C = Commercial temperature range (0°C to 70°C)
D = SOIC-16 package (plastic surface-mount package)

Well I think there is still a chance that the LX1664CD is able to go down to 1.3 volt because it supports 1.8 volt and that falls in the same category via VID4 = 0. There is a motherboard on Ebay under the title [ Vintage Merit System Mainboard Intel BX Pentium III M6TBA ] wich is a version 1.5 and according to the photos of the box it supports coppermine and it has an LX1664CD installed - see photo

The MSI adaptor arrived. Surprisingly I am still waiting on the modified Teleron CPU.

PARKE wrote on 2025-04-13, 13:18:

Well I think there is still a chance that the LX1664CD is able to go down to 1.3 volt because it supports 1.8 volt and that falls in the same category via VID4 = 0. There is a motherboard on Ebay under the title [ Vintage Merit System Mainboard Intel BX Pentium III M6TBA ] wich is a version 1.5 and according to the photos of the box it supports coppermine and it has an LX1664CD installed - see photo

Okay, so the slotket arrived and the CPU will arrive soon, I am having trouble removing the OLD Pentium 3 Slot 1 CPU, the online tutorials don't seem to help because I am not seeing retention clips or levels on the side pillars.

Let me know if you have any suggestions.

I thought I attached an image to the last post but it didn't show. Here it is. The Slot 1 P3

Matt The Cat wrote on 2025-05-13, 23:11:

I thought I attached an image to the last post but it didn't show. Here it is. The Slot 1 P3

I got it out by unscrewing all four screws of the side pillars and removed them, but this isn't the typical means is it?

Okay, the CPU arrived, but I realized yesterday something that I never considered, the requirement of thermal paste, and that it would need a socket 370 cooler.

I ordered both yesterday so they should be here next week.

Where all will I need to apply thermal paste? I will just look it up when the time comes, but anyway specific advise is welcome.

It actually fricken works, the BIOS post misidentifies the speed as 370B Mhz. But windows knows: 1400 MHz.
Should it actually run faster, I mean, it has the same FSB speed as the Slot 1 CPU did, and I made sure to configure everything right with the slotket, so I guess so. I will let you know if Minecraft runs better.

Frick, it frozen while on the web, I shut it down, and turned it back on, and what do you know error beep. Maybe it overheated, I had the thermal paste, the heat sink and the fan on it. Why fail now... @PARKE any suggestions?

I let it sit and turned it back on, fan blades spining on cpu too. Could it be slowly overheating/and or overvolting despite having made it to windows the first time? The beep is like one tone, the other right after , da do da do da do da do and it starts before it can make it to windows now.

PARKE wrote on 2025-04-13, 13:18:

Well I think there is still a chance that the LX1664CD is able to go down to 1.3 volt because it supports 1.8 volt and that falls in the same category via VID4 = 0. There is a motherboard on Ebay under the title [ Vintage Merit System Mainboard Intel BX Pentium III M6TBA ] wich is a version 1.5 and according to the photos of the box it supports coppermine and it has an LX1664CD installed - see photo

Sorry for quoting but I am in dire straights with this CPU. Is this really just a sign it's overheating? Is it overvolting, or would it not boot to that point. The first time being getting all the way to windows and starting a couple apps then freezing.

I set the Boards CPU ID to match the FSB and. Volt configuration, should I just set both to auto?

Here is another picture. It seems to show the CPU running at essentially a proper voltage and a reasonable temperature?

At this point I've thrown in the towel. I tried changing the jumpers to manual and testing different things. I removed and redid the thermal paste and made extra sure to loosening without overly so doing it with the heatsync as the modded Tualatin Celeron seller recommends. I doubley made sure that it was fully seated all the way, but it just doesn't work. There is a cool down, but I don't know exactly what it is. I went back to the pentium III 450MHz for now, and it works as it did before. Hopefully something good will come out of this situation in the future. Thank you for all of your support.

There is one aspect that could be causing problems with this sort of set up. The high-end Coppermines and Tualatins may draw more power (in amps) than what the 8.4 vrm of the motherboard can handle. You can read about it in the second part of this article:
http://www.duhvoodooman.com/powrleap/LFL/Slot-T_1.htm

PARKE wrote on 2025-05-20, 08:13:

There is one aspect that could be causing problems with this sort of set up. The high-end Coppermines and Tualatins may draw more power (in amps) than what the 8.4 vrm of the motherboard can handle. You can read about it in the second part of this article:
http://www.duhvoodooman.com/powrleap/LFL/Slot-T_1.htm

I confirm, I had the same issue with an Amptron PII-3100 board which refused to work with power hungry Katmai or Coppermine CPUs.
After I replaced the CEB603AL MOSFETs with CEB703AL, the board now works perfectly with any CPU I throw at it, including a P3 Coppermine 1 GHz or a Tualatin 1.4 GHz. So I'm 99.9999% sure that this is also OP's problem.