justin1985 wrote on 2025-01-28, 23:35:

The fins of the heatsink seem to be too widely spaced to screw a fan on directly (like you see done on Socket7 coolers).

Is it a problem to use а thicker screws?

Exactly ^ grab some fat nylon long screws and mount a fan in the middle of it.
fwiw: Your case is not the same type those Seimens had, they had direct airflow across those type HS much like some Compaq's.

Case design was very similar where the PSU fan's airflow was directed over the CPU heatsink.
Difference was maybe a plastic cover to help direct the air and maybe a more powerful fan.

What I've done in some cases is hang twist ties off something (that cross bar is perfect) with a fan on the end.
This also adsorbs vibration which makes it slightly quieter.

Zip ties bro

I have some of these coolers where the fan is mounted with a Y-shaped sheet metal bracket jammed between the fins.
Usually these passive cooling should be sufficient with a good housing fan.
SNI, Compaq and other OEMs build lots of these passively coled systems, avoiding noisy CPU-fans.

Can't hurt. I'd just slap an 80mm on an angle and zip tie somehow.
They were pretty much designed to run without so it's not like you have to put too much thought into it.

analog_programmer wrote on 2025-01-29, 00:03:

justin1985 wrote on 2025-01-28, 23:35:

The fins of the heatsink seem to be too widely spaced to screw a fan on directly (like you see done on Socket7 coolers).

Is it a problem to use а thicker screws?

I'd been digging around my PC parts box and really couldn't find any that were both long enough to pass through a fan, and fat enough to grip the fins. (but lots of short fat ones, evidently for screwing into a fan from the outside of a case).

But I tried the old ice cream tub of random leftover screws of doom in the cupboard under the stairs, and eventually found two wood screws that did the job!

Both of the 50mm fans I had were extremely loud, so I tried a 40mm NoiseBlocker brand one (like the 60mm mounted on the case) and it seems to have made a difference - thanks to everyone for reassuring me it would be worth it! (removing the Slot1 processor cartridge was terrifying!)

It turns out there is only one populated fan header on the motherboard through, but the manual pointed me to the second one being just left of the bank of four capacitors in front of the CPU. It should be fine to just solder in some DuPont type headers to the unpopulated holes, right? (I can't see any other component pads unpopulated nearby)

eisapc wrote on 2025-01-29, 08:00:

I have some of these coolers where the fan is mounted with a Y-shaped sheet metal bracket jammed between the fins.
Usually these passive cooling should be sufficient with a good housing fan.
SNI, Compaq and other OEMs build lots of these passively coled systems, avoiding noisy CPU-fans.

Interesting - I'd seen a Compaq Deskpro set up like that, but the Slot 1 had a weird horizontal mounting, which made it much more obvious how the air would be ducted/drawn through. The vertical Slot1 just seems like a solid wall blocking air flow, really ...