Not with that Slotket unless you buy an interposer for the Tualatin or do a pin mod, then the motherboard still has to be able to supply the 1.45v the Tualatin requires. Slotkets designed for Coppermine dont supply voltage they simply pass it through from the motherboard, they did make slotkets for Tualatin but they are exceptionally rare to find in the wild and use one of the Molex 12v connectors to provide the 1.45v.

You should do a bit of Googling before embarking on any modifications, its not a super easy mod and will require some previous soldering skill.

slotket modding instructions: Re: Would bios block tualitin on a 440bx board?

rasz_pl wrote on 2023-08-06, 09:37:

slotket modding instructions: Re: Would bios block tualitin on a 440bx board?

Roman@apple_rom is strongly reinsured, VttPwrGd (AK4) is easier to connect with Vcc (AM4), and not with Vtt.
Vtt still appears before Vcc, so the sequence of signaling is not violated.
But do not need to wind the wire between the rows of pins.

nizce wrote on 2023-08-06, 09:31:

But seems it should be possible without frying the CPU?

This was the favorite pastime of all 440BX motherboard owners in the 2000s.

With any degree of modification (from winding wires to drilling a board), you will need a multimeter, steady hands and a keen eye. Well, or at least a lens, magnifying glasses or a microscope.

No, and getting it working isnt a mod for the faint of heart either.

Thanks for all the input.

Just sat down and tried to get started with the CPU and the generic slotket which supports coppermine according to the manual.

I bridged AK4-AN11 on the CPU.

Found this article regarding moddig a generic slotket: https://www.oocities.org/_lunchbox/generic_slotket_mod.html

They say to check for: “connectivity to Vss or Vcc: AN11, AN15, AN21, AL13, AL21, AK16, AH20, AA33, AA35, U35, U37, S33, S37, G35, G37, E23. If these pins are not connected at all, we need to bridge Vcc to them”

I’ve checked and all have continuity to VSS. Also checked half of them for continuity to VCC also, but none had that.

Since they state to check for continuity to Vss OR Vcc, I guess it should be fine. But the rest of their example they connect their missing pins to Vcc.

Anyone know if continuity to Vss is OK, or does it have to be Vcc?

--EDIT--
Just found a couple of old forum posts linked on the page mentioned above where a user managed to get a Tualatin Celeron 1.3 to work by doing the below.
I guess he got 1.5v doing the pins mentioned in step 3, and in my case I want 1.45 so I should rather do AM34-AK36(VID25mV)-AM36(VID1)-AL35(VID0).
But other than that, it doesn't seem like he had to do anything else to the sloket so that's good news. If a Pentium III doesn't require extra steps than that of the Celeron he used.

1. Isolated AN3, AJ3, AK4
2. Connected AK4-AK26
3. Connected AM34 - AK36
4. Connect G35 to G37

As with any popular (albeit long-standing) topic, a more of urban legends was born.
1. Check connection G35 to G37 at socket. At any copermine-ready system its must be connected by default. But there are exceptions, so you need to make sure. All Vtt does not need to be checked, it is enough that it enters several pins.
2. Isolated AJ3, AK4.
- AJ3 - its RESET and must be float,
- AK4 (CPU side) is Vttpwrgd and must be pulled to any ~1.5V source. Vtt OR Vcc. In general, it doesn’t matter, as long as there is a logical 1. Easiest way - AJ5 or AM4. It is easier to wind the wire on AM4.
3.1. If your adapter has voltage jumpers (Or you will wind the wires on the VID to get the desired voltage - like AM34-AK36-AL37) , you don't need to isolate AH3. The Vid must be in Hi-Z state, otherwise, from noise, the input will randomly switch and change the state of the Vids.
You set any voltage (1.45 or 1.5V) and that's it.
Just make sure Vid4 is properly grounded. Or get 2+ Volts on the CPU.
3.2. If you mod the socket itself so that any Tualatins can be inserted, then VID4(the same Vid25mv) in the socket is removed and the hole in the board itself is grounded.
On Dyn-OE AN3 at CPU side (connects to Vtt, for example, to AN11).
Then the processor itself will set the voltage.

Thats all.

I did the mod for generic slotket and BX440 mobo GA-6BXC and have some stats:

1166 PIII-S does not start on 133mhz, 112Mhz stable.
1266/1400 PII-S starting, working, gets stuck under heavy load. 112Mhz stable.

Cel 1100, 1200 @ 112Mhz (1.34ghz) works super stable.

i tried 3 generic slotkets and all of them won't work @ 133Mhz. maybe it's just my mobo issues. But when i use P-III Coppermine (650/100/256 Slot1) @ 133Mhz - it is also super stable...

dm- wrote on 2023-08-23, 04:28:

gets stuck under heavy load.

A typical problem is when the adapter is not finished.
Or Din_oe "pulls" and periodically the supply voltage drops to 1.3 Volts.
Or Vtt_power_good is not pulled up to "logical 1" and the CPU disconnects the AGTL bus from the northbridge.
Usually, either both work on bus 133, or neither Сopper nor Tualatin
Although there may be motherboard bugs, it doesn't look like it.

Curious, as I have also Tekram P6-B40-A4x with patched bios and a generic modified slotket that faces the same behaviour. With a 1Ghz coppermine 133FSB it works rock solid, but fails with a Tualatin 1266 at 133FSB after bootup.

If I lower the FSB to max 112Mhz it gets stable again and I can even play demanding games. My suspect is that some morherboards fail with such high frequencies, but I've never went deep into investigating it. Curious!

Strange, I have modded many Tualatin CPUs and slotkets to work with old Slot1-motherboards. Never had any problems with 133+ FSB clocks.

dj_pirtu wrote on 2023-08-23, 08:36:

Strange, I have modded many Tualatin CPUs and slotkets to work with old Slot1-motherboards. Never had any problems with 133+ FSB clocks.

If the VRM isnt quite up to the mustard voltage wise then its likely it wont be able to hit the right bus speeds without some loss of stability, not all slot 1 boards came with strong VRMs. Could even just be a weak component in the VRM that needs changing out, slot 1 boards are not getting any younger so its also worth checking the VRM components.

Even a slight droop may be enough to stop a 133 FSB from being stable.

I don't think.
High-frequency Coppermine also consumes a lot of energy.

I have not seen such that Copper would work on bus 133, but Tualatin would not.

There are rumors that this may be a problem with the Vtt power supply on Asus motherboards. But, again, I have not seen this.
On a correctly converted adapter, of course. For incorrectly - that's how it all behaves.
You go into the BIOS, there is a voltage of 1.45V.
After 3 minutes - 1.3V.
Because the capacitance of the input DYN_oe is discharged and the VIDs outputs are closed.
Or everything is fine in BIOS, Windows is installed. The slightest load and reboot.
On a non-pulled Vtt_power_good - typical behavior.

But, either both do not pull the 133 MHz bus, or both work on it.

shevalier wrote on 2023-08-23, 11:14:

I don't think.
High-frequency Coppermine also consumes a lot of energy.

And probably more than the Tualatin cores?

H3nrik V! wrote on 2023-08-23, 11:25:

shevalier wrote on 2023-08-23, 11:14:

I don't think.
High-frequency Coppermine also consumes a lot of energy.

And probably more than the Tualatin cores?

https://www.mouser.com/catalog/specsheets/int … on_24445209.pdf
p 28
vs
https://datasheet.octopart.com/RK80530KZ01251 … et-11890764.pdf
p19
The difference is near 10%.

H3nrik V! wrote on 2023-08-23, 11:25:

shevalier wrote on 2023-08-23, 11:14:

I don't think.
High-frequency Coppermine also consumes a lot of energy.

And probably more than the Tualatin cores?

IIRC copper mine is 1.6 - 1.8v while Tualatins are 1.45 - 1.5v so Tualatins should be easier on the VRM, though this may be offset a bit due to Tualatin generally running faster clocks with a 133FSB. The biggest issue with Tualatins and Slotkets is the Motherboard being able to supply the 1.45 volts, its not a normal voltage for Slot 1 so many VRMs on slot 1 boards dont natively support it.

H3nrik V! wrote on 2023-08-23, 11:25:

shevalier wrote on 2023-08-23, 11:14:

I don't think.
High-frequency Coppermine also consumes a lot of energy.

And probably more than the Tualatin cores?

Mmm that would be one of the differences between working Coppermine and non working Tualatins.

An average around 1Ghz Coppermine pulls around 30w at 1.75v = 17.14A. For a 30wTualatin working at 1.45A, it will pull near 21A.

Checking documentation I found for example an i810 official Intel board manual that says don't use cpus that pull more than 22A, but I suppose it just depends on the board design!

Talking about my Tekram board, the 1266 P3-S I'm refering to is a modded one by the Korean guy. It works perfectly fine at 1266Mhz in other S370 boards so the issue here might be either the slotket or the board that refuses to work at above 1050Mhz or so using 133 FSB.

mmx_91 wrote on 2023-08-23, 11:59:

Mmm that would be one of the differences between working Coppermine and non working Tualatins. […]
Show full quote

H3nrik V! wrote on 2023-08-23, 11:25:

shevalier wrote on 2023-08-23, 11:14:

I don't think.
High-frequency Coppermine also consumes a lot of energy.

And probably more than the Tualatin cores?

Mmm that would be one of the differences between working Coppermine and non working Tualatins.

An average around 1Ghz Coppermine pulls around 30w at 1.75v = 17.14A. For a 30wTualatin working at 1.45A, it will pull near 21A.

Checking documentation I found for example an i810 official Intel board manual that says don't use cpus that pull more than 22A, but I suppose it just depends on the board design!

Talking about my Tekram board, the 1266 P3-S I'm refering to is a modded one by the Korean guy. It works perfectly fine at 1266Mhz in other S370 boards so the issue here might be either the slotket or the board that refuses to work at above 1050Mhz or so using 133 FSB.

Are you using a modded CPU on a modded Slotket ? Since the mods the Korean guy does means itll work in any Coppermine supported Slotket/motherboard with no further mods.

Trashbytes wrote on 2023-08-23, 12:06:

mmx_91 wrote on 2023-08-23, 11:59:

Mmm that would be one of the differences between working Coppermine and non working Tualatins. […]
Show full quote

H3nrik V! wrote on 2023-08-23, 11:25:

And probably more than the Tualatin cores?

Mmm that would be one of the differences between working Coppermine and non working Tualatins.

An average around 1Ghz Coppermine pulls around 30w at 1.75v = 17.14A. For a 30wTualatin working at 1.45A, it will pull near 21A.

Checking documentation I found for example an i810 official Intel board manual that says don't use cpus that pull more than 22A, but I suppose it just depends on the board design!

Talking about my Tekram board, the 1266 P3-S I'm refering to is a modded one by the Korean guy. It works perfectly fine at 1266Mhz in other S370 boards so the issue here might be either the slotket or the board that refuses to work at above 1050Mhz or so using 133 FSB.

Are you using a modded CPU on a modded Slotket ? Since the mods the Korean guy does means itll work in any Coppermine supported Slotket/motherboard with no further mods.

No sorry! Slotket is stock, it's a generic branded '370CPU'. Since I discarded this build option, the Tualatin now lives in a D815EEA socket 370.

dm- wrote on 2023-08-23, 04:28:

Screenshot 2023-08-23 at 08.20.05.png […]
Show full quote

Screenshot 2023-08-23 at 08.20.05.png

I did the mod for generic slotket and BX440 mobo GA-6BXC and have some stats:

1166 PIII-S does not start on 133mhz, 112Mhz stable.
1266/1400 PII-S starting, working, gets stuck under heavy load. 112Mhz stable.

Cel 1100, 1200 @ 112Mhz (1.34ghz) works super stable.

i tried 3 generic slotkets and all of them won't work @ 133Mhz. maybe it's just my mobo issues. But when i use P-III Coppermine (650/100/256 Slot1) @ 133Mhz - it is also super stable...

I don't know what it is about PIII-S CPUs, but they generally seem to be harder to drive for older motherboards. I've seen it a couple of times now: your FSB133-ready Slot 1 or S370 motherboard happily runs Coppermine and adapted Tualatin-256 CPUs at crazy, overclocked bus speeds. But drop in a PIII-S, and if you're lucky the board will let you run it at stock bus speeds. There's a good chance, though, that you'll have to underclock the bus a bit (or a lot; perhaps all the way down to 100 MHz) to stabilize it.

Perhaps it's because PIII-S is intended for servers, but something is slightly different about the way the CPU operates. It seems to requires higher drive strength than Tualatin-256, which not all Coppermine-native boards can provide.