The cartridges for Coppermine PIIIs are basically like a slocket without a ZIF socket, it just exposes the soldered-on CPU pins in the SC242 form factor. Once you've desoldered it, you'd need to mount the BGA onto an appropriate adapter for fitting in a PGA370 socket. Which all sounds like a fiddly nightmare compared to just buying the Socket 370 version.

socket 370 p3 cpus are $5-10

improbable

Just sell the Slot 1 and buy a Socket 370. It's probably a profitable trade and you don't have to destroy a CPU. I've seen someone manually solder a BGA CPU. In addition to all the extra equipment you'd need, it looks incredibly frustrating.

The SECC package was used to integrate the level 2 memory cache with the CPU without it being part of the CPU itself, so if it were possible to remove the CPU from the SECC package and use it on a Socket 370 motherboard it would have no L2 cache. Here's a review of the Celeron 366 that goes into detail: https://www.anandtech.com/show/219

Repo Man11 wrote on 2023-03-22, 03:14:

The SECC package was used to integrate the level 2 memory cache with the CPU without it being part of the CPU itself, so if it were possible to remove the CPU from the SECC package and use it on a Socket 370 motherboard it would have no L2 cache. Here's a review of the Celeron 366 that goes into detail: https://www.anandtech.com/show/219

This was the first thing that popped into my mind when reading the thread title.

Slot 1 CPUs are more than just a Slocket with a CPU on them. The other chips on the CPU's PCB are cache.

Also, if it's a high clocked 100Mhz FSB CPU it is probably worth enough to justify selling it and buying whatever you need for the other build.

Repo Man11 wrote on 2023-03-22, 03:14:

The SECC package was used to integrate the level 2 memory cache with the CPU without it being part of the CPU itself, so if it were possible to remove the CPU from the SECC package and use it on a Socket 370 motherboard it would have no L2 cache. Here's a review of the Celeron 366 that goes into detail: https://www.anandtech.com/show/219

Didn't this change with the Coppermine and Mendocino Slot1 Carts ..pretty sure they were just the 370 CPU slapped onto a SECC2 cart, they shouldn't have cache chips on them. I cant recall if Katmai had separate cache but since it was just a Deschutes overclocked with SSE and better L1 handling I assume it did.

Not that I'm suggesting anyone should do this to a Coppermine or Mendocino Slot1 but in theory you could do it.

TrashPanda wrote on 2023-03-22, 04:09:

Repo Man11 wrote on 2023-03-22, 03:14:

The SECC package was used to integrate the level 2 memory cache with the CPU without it being part of the CPU itself, so if it were possible to remove the CPU from the SECC package and use it on a Socket 370 motherboard it would have no L2 cache. Here's a review of the Celeron 366 that goes into detail: https://www.anandtech.com/show/219

Didn't this change with the Coppermine and Mendocino Slot1 Carts ..pretty sure they were just the 370 CPU slapped onto a SECC2 cart, they shouldn't have cache chips on them. I cant recall if Katmai had separate cache but since it was just a Deschutes overclocked with SSE and better L1 handling I assume it did.

Not that I'm suggesting anyone should do this to a Coppermine or Mendocino Slot1 but in theory you could do it.

Yes, Katmai did have external cache chips on the Slot 1 PCB, and probably also tag ram. I agree that Coppermine and Mendocinos seems to be just cpus on a slotket. However, they are bga cpus, so not exactly solderable, and whether or not they're 370 ball or something else, I wouldn't know ...

So no point of going that route. Will buy a Socket 370 CPU instead. Thanks all!