DEC Alphaserver 4100 CPU fans

Patrick Finnegan pat at
Wed Jun 10 10:03:17 CDT 2020

If you have a model number and/or pictures, we could probably figure out a
modern replacement.  The biggest things to try to match would be size, CFM,
voltage, and the number of wires (for any PWM control and RPM sensor).

Digikey seems to have a fairly good assortment of available fans.


On Wed, Jun 10, 2020 at 12:55 AM Richard Loken via cctalk <
cctalk at> wrote:

> So gentlemen, my Alphaserver 4100 shut itself down with a sad announcement
> about a dead CPU fan.  I have a parts mule which has donated a CPU fan a
> couple years ago and I can take the second and last CPU fan from there but
> then I have no more fans.
> Can the CPU fan be obtained?  Can they be rebuilt?
> The 4100 has a series of fans between the 3 power supply slots and the
> main backplane which I found could not be easily obtained so I tore them
> all apart and replaced the bearings with good results but I suspect that
> the lttle CPU fans will not respond so well to attempts at repair.
> --
>    Richard Loken VE6BSV                   : "...underneath those tuques we
> wear,
>    Athabasca, Alberta Canada       : our heads are naked!"
>    ** rlloken at **         :    - Arthur Black

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