Re: R10000-150mHz_vs_R12000-300mHz...(?)

From: Tristram Scott (tristram.scott_at_ntlworld.com)
Date: 03/21/05 

Date: Mon, 21 Mar 2005 09:51:39 GMT

In comp.sys.sgi.apps Atro Tossavainen
<Atro.Tossavainen+news@helsinki.finland.invalid> wrote:
>
> How many fans are there in the Octane? Are they reasonably standard
> components and is it possible to replace them with quieter ones of an
> otherwise identical spec? I'm not afraid of getting my hands dirty,
> particularly with the one I've got at home.
>

They have three fans. The one on the PSU is easy to replace if you have
the Cherokee one with the silver handle. On the older ones (with the black
handle) it requires disassembly of the PSU. As for finding a quieter one
with the same spec, I have not managed to do so with any level of success.
I put in one made by Y.S. Tech, FD12387S-1I. Supposedly a bit quieter, and
with slightly greater throughput. When installed it turned out to be
louder than the Panaflo FBA12G12U1A I was replacing.

I think the problem was that the noise is not just from the fan itself, but
from all the air movement throughout the machine. The new fan had a
slightly greater airflow, and hence (I guess) greater total noise.

In the end I stuck it in a corner with a pillow over it to muffle it, but
still allow sufficient airflow that it doesn't overheat.

Given that mine doesn't run with fast fan ever (dual 250, SSI, 1.5GB RAM) I
might perhaps drop in a lower spec fan. If it overheats then it can always
go to fast fan mode...

The topic of replacing fans in the Octane has been discussed many times in
these groups. I'm not aware of anyone reporting astounding success, with
the exception of people who stuck the thing in a padded box. 

-- 
Dr Tristram J. Scott               
Energy Consultant

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