I've put an 800 MHz Coppermine in my R500 for whatever that's worth.

Hmmm alright. I guess I'll start watching eBay for either an 800 or 1.0 that isn't $250.

I have a T600r Dell board and it took a 1.0 Ghz processor on a slotket. Is it a BX-2 board (2 ISA slots) or a BX-3 board (1 ISA slot)... Mine is a BX-3 and it works.

Grem Five wrote on 2025-07-26, 22:49:

Is it a BX-2 board (2 ISA slots) or a BX-3 board (1 ISA slot)... Mine is a BX-3 and it works.

It must be a BX-3, there's only one ISA slot.

https://theretroweb.com/motherboards/s/dell-s … 0bx-3-seattle-3

These things were super common circa Y2K and several came to me for upgrade early 2000s. They all got bigger hard disks, Windows 2000/XP, 768 MB RAM, GeForce 4 MX, and 1.2-1.4 GHz Tualatin Celerons on PowerLeap PL-iP3/T adaptors.

Unfortunately the PowerLeaps are stupid expensive now. Plus they need recapping.

It'll work fine, I've got a 1Ghz in my T500 for good few years now.
Dell makes surprisingly good retro PC's

Only "issue" you get is cosmetic where post screen will display the model as @00

As you've noticed Slot 1 prices increase dramatically once you reach 600Mhz, S370 CPU's are a bit cheaper and an option if you can find a good price on a slocket adapter.

Yes it should.
I had one in mine. It's currently running a Nehemiah.

IIRC, my Intel SE440BX-2 is too old to run Coppermines - the VRM doesn't have the right voltages for it. Might be an issue on the Dell board too ..?

H3nrik V! wrote on 2025-07-30, 04:10:

IIRC, my Intel SE440BX-2 is too old to run Coppermines - the VRM doesn't have the right voltages for it. Might be an issue on the Dell board too ..?

Yeah that's what I had been seeing too. I need to get the case lid off and see if it's 100% a BX-2 or not. Everything I had read up until I made this post suggested it was only compatible with up to the Katmai 600 chips.

Usually, Intel's motherboards (oem for intel/ by intel) can't work with nothing, which no in CPU support list
It's only bios protection feature ( or issue)

flux1270 wrote on 2025-07-30, 04:20:

H3nrik V! wrote on 2025-07-30, 04:10:

IIRC, my Intel SE440BX-2 is too old to run Coppermines - the VRM doesn't have the right voltages for it. Might be an issue on the Dell board too ..?

Yeah that's what I had been seeing too. I need to get the case lid off and see if it's 100% a BX-2 or not. Everything I had read up until I made this post suggested it was only compatible with up to the Katmai 600 chips.

Yeah, and maybe get a look on the VRM chip to see if it's even <2.0 Volt capable

Coppermines voltage incompatibility can be solved either by moving the jumper on the adapter (if there is one), or by one wire wound around the two processor pins.
Yes, 1.8 V differs from 1.7 V by the VID1 signal, which needs to be grounded.
Wow, 6% overvoltage...
Most likely, in AMI (which no one has really learned how to modify) in the BIOS from Intel there is a frequency/family ID detection by the processor and a forced halt of system.
Even if this is not the case, the lack of microcodes and the initialization cache errors for unknown processor have also not been fixed by anyone for AMI.
There are no public automatic BIOS modding tools for Pentium 2/3 motherboards with AMI BIOS.
Only if someone disassembled and made changes, which is extremely unlikely.

H3nrik V! wrote on 2025-07-30, 04:10:

IIRC, my Intel SE440BX-2 is too old to run Coppermines - the VRM doesn't have the right voltages for it. Might be an issue on the Dell board too ..?

I have a SE440BX-2 and mine works with Coppermines just fine. I did have to upgrade the BIOS though and the post screen doesn't always pick up the correct clock speed.
Also works with Tualatin and Nehemiah chips with the appropriate slocket/modded pins.

Ironically this thread pretty much sums up what I had seen online about the SE440BX CPU compatibility beforehand - a mix of yes and nos.

Errius wrote on 2025-07-28, 11:21:

Unfortunately the PowerLeaps are stupid expensive now. Plus they need recapping.

the solder on ones are supper cheap and still for sale.

flux1270 wrote on 2025-07-30, 18:02:

Ironically this thread pretty much sums up what I had seen online about the SE440BX CPU compatibility beforehand - a mix of yes and nos.

Intel and Siemens-futjitsu made great boards - simple and stable.
But you couldn't get anything out of them that wasn't in the specification.
But the boards are just magical.

The issue with non-working CPUs higher 600MHz may be related to BIOS version. On my DELL GX1 I was forced to flash A07 (not latest) BIOS in order to run 800+ MHz CPU.
I think that it is connected with TDP rising along the frequency and the platform was not able to run VRM at that power or heatsink/airflow was not enough to manage that increased heat amount. So producer decided not to get compains from the end-users about instability issues adn in new BIOS versions there's a check if CPU installed is certified for the system.

Also on GX1 I was not able to downclock any P-III to run at 66MHz FSB. System just doesn't POST. P-IIs do downclock no problem.

This is Intel as it was.
But the motherboards themselves are is a standard.