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Slot1 -> Sockel 370 Adapter help!

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First post, by Jackhead

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I want to give my Asus P2B a little upgrade. So im looking to put in a 1Ghz P3.
Well P3 1Ghz Slot 1 CPUs with FSB100 are pretty rare today so i was thinking about a 370/Slot1 adapter.
But im not sure what to buy here.
First question can i run with a adapter a 133FSB CPU at 100FSB? Are there difference on the Adapters? What i need to look for.

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Reply 1 of 27, by stef80

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Just go for the quality one with lots of jumpers (MSI and Asus are most common, there are also some generic ones).
Regarding P2B, it should be late revision ... like 1.10 for Coppermines. P3B-F 1.04 and beta BIOS for 133 FSB is recommended.

Last edited by stef80 on 2023-11-14, 20:30. Edited 1 time in total.

Reply 3 of 27, by BitWrangler

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Some quick notes...

A large proportion of Slotket adapters around are PPGA celeron adapters, meaning it's not plug and play with PIII CPUs... mods exist.

A slotket, when it supports coppermine PIII will not turn a 1Ghz 133 CPU into a 1Ghz 100 CPU, it can do nothing for a locked multiplier so CPU speed will end up at 750 on 100Mhz.

There is a thread here somewhere with many many slockets pictured and detailed, but I can't think of what to search for to dig it up, it's a search engine crack dweller at the moment.

A classic site detailing some slotket capabilities and modifications is "The Lunchbox" which is findable on this archived page https://www.oocities.org/_lunchbox/articles.html

edit: seriously though where the heck is that thread, did a couple of halfass looks before posting. Now done several "serious" looks for it, and nada... I don't know if OP was calling them slotkets though, maybe the literal translation of what they call them in german or something. Tried things like "CPU card" but too much other noise with that.

Last edited by BitWrangler on 2023-11-15, 02:45. Edited 1 time in total.

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Reply 5 of 27, by Jackhead

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Perfect, thanks alot guys!

Dos 6.22: Asus VL/I-486SV2GX4 Rev 2.0 1Mb L2 - AMD A5x86 X5 ADZ 133MHz @160MHz - 64MB RAM - CT2230 - GUS ACE - MPU-401 AT - ET4000W32P
Win98SE: Asus P5K-WS - E8600 @ 4,5GHz - Strange God Voodoo 5 6000 PCI @ 66MHz PCI-X - 2GB DDR2 1066 - Audigy 2 ZS

Reply 6 of 27, by STX

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Jackhead wrote on 2023-11-14, 20:17:

...First question can i run with a adapter a 133FSB CPU at 100FSB?...

I own 2 Slot-1→Socket-370 adapters. They both work with a 1.1 GHz Coppermine Celeron (100 MHz FSB). Neither of them works with a 1.0 GHz Coppermine Pentium III (133 MHz FSB). Only one of them, pictured here, works with a pin-modded 1.4 GHz Tualatin Celeron (100 MHz FSB).

stef80 wrote on 2023-11-14, 20:26:

...P3B-F 1.04 and beta BIOS for 133 FSB is recommended.

Hmmm....that sounds interesting. Even with a BIOS patch that enables 133 MHz FSB, I would assume that the slotket would also need to support 133 MHz FSB in order to use a 133 MHz Socket 370 CPU with this motherboard.

Reply 7 of 27, by mockingbird

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What I'd like to see is a community-made slotket adapter. The prices on eBay are ridiculous - even for slotkets that only support Mendocino.

Instead of a a zif socket it could use female pin headers.

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Reply 9 of 27, by Gmlb256

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stef80 wrote on 2023-11-14, 20:26:

P3B-F 1.04 and beta BIOS for 133 FSB is recommended.

Not necessarily, I was able to set the FSB to 133 MHz successfully on an ASUS P2-99 rev 1.12 motherboard. The only inconvenience was that the latest official BIOS for it didn't have proper support for 1 GHz+ CPUs but fortunately there are modded ASUS BIOSes which addresses that and has the recent microcodes.

smtkr wrote on 2023-11-15, 00:39:

Coppermine capable slotkets are as expensive as the CPUs at this point.

Yep, and mine wasn't that easy to obtain.

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Reply 10 of 27, by Shponglefan

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mockingbird wrote on 2023-11-14, 23:21:

What I'd like to see is a community-made slotket adapter.

AFAIK, the issue is the PGA370 sockets aren't being made and may not be readily available.

Without PGA370 sockets, manufacturing new slotkey adapters is moot.

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Reply 11 of 27, by Shponglefan

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smtkr wrote on 2023-11-15, 00:39:

Coppermine capable slotkets are as expensive as the CPUs at this point.

Yup. I managed to acquire a couple this past year simply by identifying all the available makes and models and scouring for whenever and wherever they become available.

They are definitely a rare commodity at this point.

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Reply 12 of 27, by mockingbird

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Shponglefan wrote on 2023-11-15, 02:06:

Without PGA370 sockets, manufacturing new slotkey adapters is moot.

Is it not feasible to substitute the PGA370 socket with female pin headers or would there not be enough clearance for that between each pin? Barring that, why not solder the CPU directly onto the slotket? The price to order several of one of these supposed newly made slotkets would be a pittance compared to something off eBay. It's a two layer PCB with only passives and perhaps a voltage regulator if you want.

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Reply 13 of 27, by Shponglefan

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mockingbird wrote on 2023-11-15, 02:09:

Is it not feasible to substitute the PGA370 socket with female pin headers or would there not be enough clearance for that between each pin?

I wouldn't think there would be enough clearance. The CPU pins are pretty close together and offset in a staggered format.

Barring that, why not solder the CPU directly onto the slotket? The price to order several of one of these supposed newly made slotkets would be a pittance compared to something off eBay. It's a two layer PCB with only passives and perhaps a voltage regulator if you want.

I suppose one could do that, but then one is not really offering a slotkey adapter so much as a slot 1 processor.

The appeal of a slotkey is being to swap out processors as needed. The minute you make it permanent by soldering in a CPU, that value becomes moot.

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Reply 14 of 27, by stef80

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STX wrote on 2023-11-14, 21:49:

Even with a BIOS patch that enables 133 MHz FSB, I would assume that the slotket would also need to support 133 MHz FSB in order to use a 133 MHz Socket 370 CPU with this motherboard.

If I remember correctly from last project (C3 Ezra@133MHz FSB), MSI adapter has open jumpers for 133 FSB. There's also "CPU define" option which is default FSB for a given CPU. I'd first try that.
133MHz FSB comes with it's offsets, like out-of-spec AGP clock (~86MHz) on 440BX chipset. Though Nvidia and 3dfx usually handle that just fine.
One of better solutions I've seen is slot-1 adapter + modded Tualatin Celeron with PCB adapters like: https://www.ebay.com/itm/283583586110, which keeps AGP bus clock in check. (Seller also offers pre-modded CPUs.)

Reply 15 of 27, by mockingbird

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Shponglefan wrote on 2023-11-15, 02:21:

The appeal of a slotkey is being to swap out processors as needed. The minute you make it permanent by soldering in a CPU, that value becomes moot.

Not me... The appeal is getting the CPU working in the system for the lowest price... Especially if it's a tualatin CPU.

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Reply 16 of 27, by Jasin Natael

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Not meaning to derail the thread but,

Going down the same road as the OP recently myself. I ordered two slotkets, one with jumpers and one without.
Having only a a handful of Socket 370 chips, and all of them but one being 133FSB models, I also ordered a 1100mhz Coppermine Celeron to test with.
I've got a few Intel Seattle boards to test with, one Dell and one the retail variant as well as a MSI non -AGP slot1/370 combo model, and a Asus HP OEM board.
Nothing great, but the Intel boards are solid, the Dell is in the original PC an XPS t450, currently running a 700mhz P3.
The retail variant is my go to retro machine at the moment and is currently running a P3 850mhz.
I've also got a Nehemiah 1.2 that works fine on the MSI, that I'd like to try on the Intel boards. Research indicates that it SHOULD work with at least one of the slotkets. Time will tell.

I'm curious as to how the Celeron 1100 with compare to the 850mhz P3 with the same hardware.
I think that it will be fairly close, maybe a bit faster due to both chips having 100mhz FSB.
There are a few SL5QV on ebay, I'd like to pick one up, but it's hard to justify as I have the 133mhz version and a good working socket 370 board if I ever want to use it.
I'll probably give in at some point, but I'd like the hold out for a SL5QW to crop up cheapish. I'm probably dreaming there.
The Celeron was like $11 shipped.

Reply 17 of 27, by Shponglefan

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mockingbird wrote on 2023-11-15, 14:25:
Shponglefan wrote on 2023-11-15, 02:21:

The appeal of a slotkey is being to swap out processors as needed. The minute you make it permanent by soldering in a CPU, that value becomes moot.

Not me... The appeal is getting the CPU working in the system for the lowest price... Especially if it's a tualatin CPU.

Any type of boutique adapter will have a higher price just from low economy of scale. The cheapest option would be getting a Socket 370 motherboard and not worrying about an adapter in the first place.

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Reply 18 of 27, by Jasin Natael

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Shponglefan wrote on 2023-11-15, 15:46:
mockingbird wrote on 2023-11-15, 14:25:
Shponglefan wrote on 2023-11-15, 02:21:

The appeal of a slotkey is being to swap out processors as needed. The minute you make it permanent by soldering in a CPU, that value becomes moot.

Not me... The appeal is getting the CPU working in the system for the lowest price... Especially if it's a tualatin CPU.

Any type of boutique adapter will have a higher price just from low economy of scale. The cheapest option would be getting a Socket 370 motherboard and not worrying about an adapter in the first place.

This is true, but it's fairly uncommon to find a socket 370 board with ISA slots.
I think this and the stellar reputation of the 440BX chipset is what draws so many people to the slocket to begin with.

Reply 19 of 27, by Shponglefan

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Jasin Natael wrote on 2023-11-15, 16:15:

This is true, but it's fairly uncommon to find a socket 370 board with ISA slots.
I think this and the stellar reputation of the 440BX chipset is what draws so many people to the slocket to begin with.

I just did an Ebay search and the third one in the list of results is Socket 370, Intel 440BX chipset and has a pair of ISA slots for$35 USD (+ shipping).

¯\_(ツ)_/¯

Last edited by Shponglefan on 2023-11-15, 18:43. Edited 1 time in total.

486 DX4-100 with 6 sound cards
486 DX-33 with 5 sound cards
Ultimate Windows XP build