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Unread postPosted: Sun Jun 22, 2008 4:20 am 

Joined: Sun Jun 08, 2008 5:22 am
Posts: 8
Location: Tornio, FI
After reading several threads about Fuel power supplies dying, I tried to dig some info about the supplies used. I'm in the process of slowly upgrading my Fuel and was wondering about the options. I've had some PSUs dead before due machines kitted out beyond the capabilities of the supply and following in the SGI Fuel specs page was somewhat interesting:

Combined 3.3-V, 5-V, and 12-V output is limited to 300 watts.
An additional 18 amps @ 12 V powers the onboard switching regulators.

So we have a power supply of nominally capable of pushing 430 watts, but the real oomph it can give out maxes out at 300. Bit like el cheapo ATX supplies which promise huge wattage, which peters out long before reaching the max cap. For me 300 watts sounds like pretty little, especially if the fuel is above the minimum: Processor upgrade, all hd bays in use, scsi, fc, sound, V12, 4G of memory... And the descriptions of dying fuel power supplies sound pretty much like any description of a supply dying a slow and painful death due overdrawing current.

Looking at the PSU replacement part names I found the following PDF from the defunct NMB supply department (this is/has been sold as replacement of Fuel PSU part No 060-0140-006 or 060-0140-007) Fuel 460W supply. What makes the pdf interesting is that the pinout is exactly the same as ATX v2.2 main power, ATX v2.2 main power pinout. I didn't find the original Fuel PSU pinouts though.

So definitely it looks viable to replace Fuel PSU with a regular modern ATX, but is it doable in practise? so far any discussions about the subject have stopped on the it must be special SGI supply to get it working level, and people who were trying a regular ATX stopped reporting of the progress at some point.

Any comments welcome :)


:Fuel:, Some Usparcs running FreeBSD, Amiga3k towered and numerous Intel clones

Unread postPosted: Sat Jan 22, 2011 2:04 am 

Joined: Mon Mar 17, 2008 7:54 am
Posts: 39
Did you ever find the original Fuel PSU pinouts?

I found this PSU that's very similar to the 460W (same model #) but slightly different pinouts
from same company ... /nmbps.pdf

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