I would presume that the holes in the SECC PCB line up with the notched sections of the hestsink? The clips therefore go on the finned side, clipping round the heatsink but through the PCB? If that’s the case then I’ve no idea what the holes are for in the heatsink, possibly for alignment using the “tangs” in the middle of the clip?

Can we get a picture of the clips held up to the CPU to get an idea of scale?

paradigital wrote on 2025-01-19, 09:38:

I would presume that the holes in the SECC PCB line up with the notched sections of the hestsink? The clips therefore go on the finned side, clipping round the heatsink but through the PCB? If that’s the case then I’ve no idea what the holes are for in the heatsink, possibly for alignment using the “tangs” in the middle of the clip?

Can we get a picture of the clips held up to the CPU to get an idea of scale?

hey, thanks for answering. The holes in the new heatsink line up with the holes in the secc. it almost looks like these heatsinks are supposed the be screwed to the cartridge but they included the wrong mounting material^^ here are some additional pix.

Looking at your last pic, the holes on the heatsink and the holes on your SECC cartridge do not line up, the SECC cartridge is wider spaced.

That type of heatsink is meant for >Pentium 2 SECC< cassettes. The heatsink clips fit in the holes of the metal frame on the cpu side.

paradigital wrote on 2025-01-19, 10:46:

Looking at your last pic, the holes on the heatsink and the holes on your SECC cartridge do not line up, the SECC cartridge is wider spaced.

You are right. But that leaves us at the start: what are these holes for?

Also I'd like to ask @PARKE: does that mean my CPUS have the wrong format? Bc none of mine look like the one in your picture... they all have a black plastic plate at the back and an exposed pcb with the die in front.

Kampfkoloss wrote on 2025-01-19, 12:26:

paradigital wrote on 2025-01-19, 10:46:

Looking at your last pic, the holes on the heatsink and the holes on your SECC cartridge do not line up, the SECC cartridge is wider spaced.

You are right. But that leaves us at the start: what are these holes for?

Also I'd like to ask @PARKE: does that mean my CPUS have the wrong format? Bc none of mine look like the one in your picture... they all have a black plastic plate at the back and an exposed pcb with the die in front.

The difference is SECC vs SECC-2. That cooler is Pentium II only, which is SECC. It requires the built in cartridge heat spreader.

Kampfkoloss wrote on 2025-01-19, 12:26:

Also I'd like to ask @PARKE: does that mean my CPUS have the wrong format? Bc none of mine look like the one in your picture... they all have a black plastic plate at the back and an exposed pcb with the die in front.

Yes, sorry to bring bad news, but the heatsinks that are meant for SECC (= Pentium 2 package) are useless for SECC2 (Pentium 3 package. Intel describes it so:
oooooooooooo
There are several variations to the S.E.C. Cartridge form factor. They are the Single Edge Contact Cartridge (S.E.C.C.) which has a cover and a thermal plate, the Single Edge Contact Cartridge 2 (S.E.C.C.2) which has a cover, but no thermal plate, and the Single Edge Processor Package (S.E.P.P.) which has no cover or thermal plate. In implementations with no thermal plate, the customer can attach a heatsink directly to the MP Package or die.
oooooooooooo
The heatsinks that you bought need the cartridge with the thermal plate that has the necessary slots in it for the metal clips.

PARKE wrote on 2025-01-19, 13:04:

Yes, sorry to bring bad news, but the heatsinks that are meant for SECC (= Pentium 2 package) are useless for SECC2 (Pentium 3 p […]
Show full quote

Kampfkoloss wrote on 2025-01-19, 12:26:

Also I'd like to ask @PARKE: does that mean my CPUS have the wrong format? Bc none of mine look like the one in your picture... they all have a black plastic plate at the back and an exposed pcb with the die in front.

Yes, sorry to bring bad news, but the heatsinks that are meant for SECC (= Pentium 2 package) are useless for SECC2 (Pentium 3 package. Intel describes it so:
oooooooooooo
There are several variations to the S.E.C. Cartridge form factor. They are the Single Edge Contact Cartridge (S.E.C.C.) which has a cover and a thermal plate, the Single Edge Contact Cartridge 2 (S.E.C.C.2) which has a cover, but no thermal plate, and the Single Edge Processor Package (S.E.P.P.) which has no cover or thermal plate. In implementations with no thermal plate, the customer can attach a heatsink directly to the MP Package or die.
oooooooooooo
The heatsinks that you bought need the cartridge with the thermal plate that has the necessary slots in it for the metal clips.

Thanks for sharing your knowledge with me. I knew there were SECC and SECC 2 but I didn't know they were so different. My Katmai 500 has exactly the same format as my Deschutes P2 400 and they both have a cover but no thermal plate.

So I'm going to the hardware store getting some screws and nuts. Thanks again folks!

Kampfkoloss wrote on 2025-01-19, 14:10:

PARKE wrote on 2025-01-19, 13:04:

Yes, sorry to bring bad news, but the heatsinks that are meant for SECC (= Pentium 2 package) are useless for SECC2 (Pentium 3 p […]
Show full quote

Kampfkoloss wrote on 2025-01-19, 12:26:

Also I'd like to ask @PARKE: does that mean my CPUS have the wrong format? Bc none of mine look like the one in your picture... they all have a black plastic plate at the back and an exposed pcb with the die in front.

Yes, sorry to bring bad news, but the heatsinks that are meant for SECC (= Pentium 2 package) are useless for SECC2 (Pentium 3 package. Intel describes it so:
oooooooooooo
There are several variations to the S.E.C. Cartridge form factor. They are the Single Edge Contact Cartridge (S.E.C.C.) which has a cover and a thermal plate, the Single Edge Contact Cartridge 2 (S.E.C.C.2) which has a cover, but no thermal plate, and the Single Edge Processor Package (S.E.P.P.) which has no cover or thermal plate. In implementations with no thermal plate, the customer can attach a heatsink directly to the MP Package or die.
oooooooooooo
The heatsinks that you bought need the cartridge with the thermal plate that has the necessary slots in it for the metal clips.

Thanks for sharing your knowledge with me. I knew there were SECC and SECC 2 but I didn't know they were so different. My Katmai 500 has exactly the same format as my Deschutes P2 400 and they both have a cover but no thermal plate.

I'll try to sell them then because the spacing of the holes doesn't match eiter 🙁

Nuts and bolts only are not going to cut it. The orientation of the holes in the heatsink is different from the holes in the CPU.
You wrote earlier: [ The holes in the new heatsink line up with the holes in the secc. ]
But that is not true from both angles - measure it before you plan how to proceed.

edit: Ah, I was just too late.

PS for your cpu's you want sinks like this:

They are common and very easy to clip on and take apart.

PARKE wrote on 2025-01-19, 13:04:

Yes, sorry to bring bad news, but the heatsinks that are meant for SECC (= Pentium 2 package) are useless for SECC2 (Pentium 3 p […]
Show full quote

Yes, sorry to bring bad news, but the heatsinks that are meant for SECC (= Pentium 2 package) are useless for SECC2 (Pentium 3 package. Intel describes it so:
oooooooooooo
There are several variations to the S.E.C. Cartridge form factor. They are the Single Edge Contact Cartridge (S.E.C.C.) which has a cover and a thermal plate, the Single Edge Contact Cartridge 2 (S.E.C.C.2) which has a cover, but no thermal plate, and the Single Edge Processor Package (S.E.P.P.) which has no cover or thermal plate. In implementations with no thermal plate, the customer can attach a heatsink directly to the MP Package or die.
oooooooooooo
The heatsinks that you bought need the cartridge with the thermal plate that has the necessary slots in it for the metal clips.

SECC2 wasnt just Pentium 3 but also later Pentium 2 which can make it confusing for getting coolers marked Pentium 2s as they used both SECC and SECC2. That Pentium 2 marking should have been left off the cooler packaging and only had SECC2 marking but they were probably sold before the release of the Pentium 3.

Kampfkoloss wrote on 2025-01-19, 14:10:

Thanks for sharing your knowledge with me. I knew there were SECC and SECC 2 but I didn't know they were so different. My Katmai 500 has exactly the same format as my Deschutes P2 400 and they both have a cover but no thermal plate.

AFAIK I have not seen any Pentium 2s with 333 MHz and slower in anything other than SECC where as anything faster 350 MHz - 450 MHz could be either SECC or SECC2 and then all Pentium 3s were SECC2.

I have 350, 400, and 450s in both packages..... 350 MHzs pictured above. {Edit Doing a quick look I dont have both packages of 450 but I know they did a SECC package.}

PARKE wrote on 2025-01-19, 15:01:

PS for your cpu's you want sinks like this:

The attachment SECC2sink.jpg is no longer available

They are common and very easy to clip on and take apart.

I know those. There are some made by Cooler Master. I haven't found them in Germany yet. Getting them from abroad makes them so expensive that I'll use cable ties with my old beat up coolers for the time being 😁

PARKE wrote on 2025-01-19, 13:04:

Yes, sorry to bring bad news, but the heatsinks that are meant for SECC (= Pentium 2 package) are useless for SECC2 (Pentium 3 p […]
Show full quote

Kampfkoloss wrote on 2025-01-19, 12:26:

Also I'd like to ask @PARKE: does that mean my CPUS have the wrong format? Bc none of mine look like the one in your picture... they all have a black plastic plate at the back and an exposed pcb with the die in front.

Yes, sorry to bring bad news, but the heatsinks that are meant for SECC (= Pentium 2 package) are useless for SECC2 (Pentium 3 package. Intel describes it so:
oooooooooooo
There are several variations to the S.E.C. Cartridge form factor. They are the Single Edge Contact Cartridge (S.E.C.C.) which has a cover and a thermal plate, the Single Edge Contact Cartridge 2 (S.E.C.C.2) which has a cover, but no thermal plate, and the Single Edge Processor Package (S.E.P.P.) which has no cover or thermal plate. In implementations with no thermal plate, the customer can attach a heatsink directly to the MP Package or die.
oooooooooooo
The heatsinks that you bought need the cartridge with the thermal plate that has the necessary slots in it for the metal clips.

I've been a dummy... if all this (very plausible) info is true, then why does the package say it's for SECC II- OR P2-Cartridges? I really don't understand that...

Kampfkoloss wrote on 2025-01-19, 16:25:

... if all this (very plausible) info is true, then why does the package say it's for SECC II- OR P2-Cartridges?

Is there a tiny inscription "made in China" on the cooler's package? 😀

Kampfkoloss wrote on 2025-01-19, 16:25:

I've been a dummy... if all this (very plausible) info is true, then why does the package say it's for SECC II- OR P2-Cartridges? I really don't understand that...

I didnt realize it might just be super bad packaging labeling - the SECC II part is wrong then.

analog_programmer wrote on 2025-01-19, 16:53:

Kampfkoloss wrote on 2025-01-19, 16:25:

... if all this (very plausible) info is true, then why does the package say it's for SECC II- OR P2-Cartridges?

Is there a tiny inscription "made in China" on the cooler's package? 😀

It says "Made in Taiwan" on the back... but I see what you mean 😁

You might even find a good deal on a heatsink by buying an unvaluable CPU/hsf combo that uses SECC2.
I did that a long time ago using heatsinks from some P2-350 SECC2 CPUs. But times change and I don't know if those are still cheap nowadays.

If you take that route, research the S-spec and make sure what you're buying is SECC2, and that the heat output is high enough to imply the heatsink is sufficient for what you're putting it on.

If you see listings with heatsinks that look like folded up pieces of light aluminum, stay away. Those completely suck but they're common on eBay, or at least they used to be. I think they must have come from some servers that had a tornado blowing through them. When Slot-1 servers got retired, they flooded eBay with heatsinks that are very inadequate for a typical system. That's what I was replacing when I ordered the P2-350s with conventional hsfs on them.

Kampfkoloss wrote on 2025-01-19, 15:59:

I know those. There are some made by Cooler Master. I haven't found them in Germany yet. Getting them from abroad makes them so expensive that I'll use cable ties with my old beat up coolers for the time being 😁

Try Electromyne:
https://www.electromyne.de/public/catalog_xml … mcid=1001431844