Based on the manual, you're limited to 100MHz FSB, so even if you got the 800EB to run, you'd be at 600MHz. I don't see anything in the manual about setting CPU voltage and I don't see any jumpers on board to configure. My bet is it won't even post with the 800EB.

But if you want to try, go for it. There are two BIOS imagines available for that board on ultimateretro.net if you feel like experimenting.

What BIOS? I don't want to brick this mobo. 😀

You are trying to run something way out of spec. That means you are experimenting (and it also means it probably won't work). If you're worried about bricking it, don't experiment.

Before you even both messing with the BIOS, you could always just put the CPU in and see if it posts.

With respect to the BIOS, you might already be running the newest BIOS. It should show you during the POST. The versions available on Ultimate Retro (which are not definitive, BTW) are

11/02/1999-I440ZX-SMC60X-2A69KB0JC-00
06/16/2000-I440ZX-SMC60X-2A69KB0JC-00

That board has a socketed DIP-32 EEPROM. If the BIOS flash goes wrong, just pop it off and flash it somewhere else. An EEPROM programmer (eg TL866) is best, but you can hot-flash on another motherboard if needs be.

Which P3-500 do you have on the board? If it's Coppermine, you should be good already. As for the P3-800EB: it has a fixed 6x multiplier and is rated for 133MHz FSB. If you run it at 100MHz FSB, its core will run at 600MHz. That's not much of an upgrade. If it works, I'd recommend looking for a P3-800E (100MHz FSB version with 8x multiplier) instead.

Finally, what slocket (slot 1 adapter) are you using? You will probably need one with voltage jumpers, as the CPU will by default ask for 1.7V, and the VRMs are designed to not deliver anything if they can't supply the specified voltage. So to get it to boot, you'll need to be able to jumper 1.8V.

My darn adapter has only one jumper which I have no idea what it does.

haker120 wrote on 2022-08-09, 11:18:

My darn adapter has only one jumper which I have no idea what it does.

Almost certainly 66MHz/100MHz.

In that case, this adapter is almost certainly unsuitable to run a Coppermine CPU on a board with a VRM that isn't explicityly Coppermine-capable.

Which one is better?

These are both designed to run Mendocino Celerons and do not work with Coppermine cpu's unless modified.

So what am I looking for?

haker120 wrote on 2022-08-09, 13:31:

So what am I looking for?

- So370 FC-PGA pinout (so not PPGA)
- voltage jumpers for the VID pins, going down to at least 1.8V

Nice-to-have: FSB 66/100/133/auto jumpers

Then I don't really know what am I looking for since 99% available adapters don't have voltage settings or have only one jumper. 😁

haker120 wrote on 2022-08-09, 13:40:

Then I don't really know what am I looking for since 99% available adapters don't have voltage settings or have only one jumper. 😁

Google the brand, model ID and revision of the slockets you find. Check for FC-PGA and/or Coppermine support.

Concrete example: I just looked on a popular auction site for overpriced stuff for "slocket". Top two hits:
Iwill Slocket II - Convert Socket 370 to Slot 1 - FCPGA Pentium III PPGA Celeron
370SP INTEL 370 PPGA/FC-PGA CARD SLOCKET Socket 370 Slot 1 adapter

In this case no need to google, both have (documented) voltage jumpers. Both also cost MUCH more than I would pay for such a device.

Here a guide that you can download:
https://drive.google.com/file/d/1kGgO3TJyFDTH … y4wVj4GJBY/view

dionb wrote on 2022-08-09, 13:50:

Concrete example: I just looked on a popular auction site for overpriced stuff for "slocket". Top two hits:
370SP INTEL 370 PPGA/FC-PGA CARD SLOCKET Socket 370 Slot 1 adapter

Hmm.... the photos of the slotket in that ad do not match the photo on the (PCChips) box. I would not bet on that horse.
That box belongs to this slotket:

PARKE wrote on 2022-08-09, 14:07:

dionb wrote on 2022-08-09, 13:50:

Concrete example: I just looked on a popular auction site for overpriced stuff for "slocket". Top two hits:
370SP INTEL 370 PPGA/FC-PGA CARD SLOCKET Socket 370 Slot 1 adapter

Hmm.... the photos of the slotket in that ad do not match the photo on the (PCChips) box. I would not bet on that horse.

Yep, looks suspiciously like a PPGA slocket - 370SP 2.0 is in your list after all. Really good link - tnx!

The 370SP 2.0 photos that I have come across are all from around week 40 of 1999 and as far as I have seen these are all Mendocino dedicated. If they were able to run Coppermines out of the box they would not need this mod:

Slotkets have become expensive enough attract scam artists, or so it seems.

Any link pliz? 😀

If you want to spend an amount of money for which you can buy a socket 370 Coppermine motherboard on a slotket than this is the way to go.
https://www.ebay.com/itm/234641871202?_trkpar … 8.c101113.m2108

Ok then I give up. 🤣