dp/n makes me think it is a dell part though the number doesn't look like a dell number

The wings one the sides of the heatsink make me think they fit and get retained in your typical slot 1 cpu retention bracket that should be fitted on your mainboard around the slot 1 connector.

Like can be seen in this photo https://i.ebayimg.com/images/g/KLAAAOSwiQpkQ-qK/s-l1600.jpg
or this one https://i.ebayimg.com/images/g/JyQAAOSwa2piLh38/s-l1600.jpg

scrap that, my memory just reminded me of the correct heatsink for those retainers.

Looks like Dell is actually where these are from, thanks

Fish3r wrote on 2026-08-02, 18:31:

Does anyone know which retention bracket is supposed to be used with these? The different brackets on a few slot 1 boards I have don't fit this kind of heatsink at all, the arms just bend outwards and look close to snapping off. I've seen posts mentioning these and that they're from some OEM systems but no-one ever seems to mention anything beyond that, unless I missed it.

This one is sold but you need a SECC 1 bracket like this:
https://tinyurl.com/3b24dpwf
They were common in HP server boards etc.

No need for a SECC 1 bracket, you just need a flat file and grind those edges off. That's what I did. It's aluminum so tends to stick on the file. Use an old one you don't need.

PARKE wrote on 2026-08-04, 09:48:

This one is sold but you need a SECC 1 bracket like this: https://tinyurl.com/3b24dpwf They were common in HP server boards etc. […]
Show full quote

Fish3r wrote on 2026-08-02, 18:31:

Does anyone know which retention bracket is supposed to be used with these? The different brackets on a few slot 1 boards I have don't fit this kind of heatsink at all, the arms just bend outwards and look close to snapping off. I've seen posts mentioning these and that they're from some OEM systems but no-one ever seems to mention anything beyond that, unless I missed it.

This one is sold but you need a SECC 1 bracket like this:
https://tinyurl.com/3b24dpwf
They were common in HP server boards etc.

The attachment PIIbracket.JPG is no longer available

The cooler is Dell, from a GX1
https://www.ebay.co.uk/itm/226741964260?chn=p … ction=view_item

To the OP.
In all honesty I wouldnt bother lookinig for it, you are chasing a unicorn down a rabbit hole with that one, the brackets come in three parts and sometimes 4, there is of course the bracket itself, which can come as a single piece or two arms then the real problem is the two small retention blocks that lock the cooler into place. Those two blocks are the real problem these days. Theyre like hens teeth to find as they came off with the CPU but they were part of the bracket and went with the CPU until they fell off, got lost and then you started looking for them nearly 20 years later.

ElectroSoldier wrote on 2026-08-04, 15:45:

To the OP.
In all honesty I wouldnt bother lookinig for it, you are chasing a unicorn down a rabbit hole with that one, the brackets come in three parts and sometimes 4, there is of course the bracket itself, which can come as a single piece or two arms then the real problem is the two small retention blocks that lock the cooler into place. Those two blocks are the real problem these days. Theyre like hens teeth to find as they came off with the CPU but they were part of the bracket and went with the CPU until they fell off, got lost and then you started looking for them nearly 20 years later.

Yes I get the impression that it'd be a waste of time to try and track down loose ones and I don't really have much interest in buying an old Dell. I should be able to cut out some larger holes in one of the brackets I have for the tabs on the heatsink to sit in.