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ULTRA RARE Intel Pentium III Coppermine SL4KL 1000/256/100/1.7V Slot 1 CPU RETRO

keke

keke

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https://www.ebay.com/itm/137703273570

Screenshot 2026-09-06 124752.png


Recommended motherboards for this beast?
 
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Is this for some sentimental build? You could build a fleet of socket 370 systems for the cost of that cpu alone...

I have an abit bh6 in the garage that I use a slotket adapter for with a 1ghz coppermine, you can get 1ghz coppermine socket 370 cpus for under $20 and use a better cooler... You might even be able to get a tualatin adapter to use them, highest was 1.4ghz on both pentium 3 and celeron tualatins. Tualatin celerons had 100mhz fsb. Can get tualatins for around $20 too.

Coppermines topped out around 1.3ghz, so running 133fsb was hit or miss, and tualatins around 1.7 if I recall correctly. If you wanted to get nuttier, get a pentium iii-s but the price jumps again.
 
RHKCommander959 said:
Is this for some sentimental build? You could build a fleet of socket 370 systems for the cost of that cpu alone...

I have an abit bh6 in the garage that I use a slotket adapter for with a 1ghz coppermine, you can get 1ghz coppermine socket 370 cpus for under $20 and use a better cooler... You might even be able to get a tualatin adapter to use them, highest was 1.4ghz on both pentium 3 and celeron tualatins. Tualatin celerons had 100mhz fsb. Can get tualatins for around $20 too.

Coppermines topped out around 1.3ghz, so running 133fsb was hit or miss, and tualatins around 1.7 if I recall correctly. If you wanted to get nuttier, get a pentium iii-s but the price jumps again.
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This. I've got two Tualatins on slockets for a couple of retro machines running on an Asus P2B and P3B-F (legendary BX boards). The Tualatins have more cache memory as well. I bought these a very long time ago.

If you want to go really retro, you can get a 600MHz Slot1 P3 coppermine for cheap and overclock it old school to 800MHz on a BX board.

The coppermines could not really do 1GHz IIRC, that 1G part in the auction may have been one of Intel's recalled ones. Tualatin on a BX was the best the BX ever got. Also, getting a slocket/motherboard that would provide the right voltages was a little tricky. Late P3B-F could use a cheap slocket. The P2B required one with voltage regulators on board.

The slocket may be the hard thing to find these days. If you don't already have a BX slot1 motherboard, going to a socket 370 board may be a better path. It will take some research the best bang for the buck as there were Tualatin Celerons as well as Tulatin PIIIs (PIII-S, IIRC). The top stock clock parts will be very expensive, back off from this to save a bunch and not lose much performance.

RHKCommander959 your post brings back memories, yes there is the whole 100Mhz vs 133Mhz bus thing plus overclocking the AGP port, so the graphics card needs to be able to handle it too and the SDRAM (no DDR). Overclocking these days is so much easier, but I had fun with the PIII architecture and it was pretty cheap. The P2B and P3B-F did all the overclocking via jumpers, you needed an Abit board to overclock via BIOS. Abit made a name for themselves with that feature.

Speaking of legendary, who remembers the Celeron 300A? :)
 
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