Pontus wrote:
Checking the pinout on the 24 pin P1 connector it doesn't match the color coding of neither ATX or WTX specs, but the _alternate_ pinout here
http://pinouts.ru/Power/wtxmain_pinout.shtml matches except for one pin. That page also states that there is a 6-pin header used with the alternate pinout for CPU power, which the Fuel uses (well, it's a 8 pin connector but 2 are not connected).
As a follow up to
Pontus' excellent description of the differences between the pinout of the 24-pin connector used in alternative WTX and
Fuel HiPro HP-W460GC33 power supplies, I took a few minutes and created a table that helps to illustrate the differences and similarities of the (alternative) WTX, the
Fuel Sparkle FSP460-60PFN, a generic Sparkle ATX2.2 FSP460-460PFN and ATX2.2 power supply pinouts side-by-side.
The WTX pinout
was taken from the pinouts.ru page linked by Pontus, the Fuel PS pinout was derived from
photographs posted by 87Porsche of the 24-pin connector on his Fuel's Sparkle FSP460-60PFN 460W power supply, and the list of
wire colors/voltages printed on the Fuel/Sparkle power supply label.
I obtained a non-SGI/ATX2.2 version of the Sparkle power supply
that uses the same FSP460-60PFN part number as the SGI version, but with an ATX 2.2 pinout. The non-SGI Sparkle FSP460-60PFN uses the same Nidec D08T-12PU cooling fan as the SGI version, which may eliminate the fan issues Pontus experienced.
The pinout of the non-SGI/ATX2.2 power supply is included in the table for comparison, as is
the standard ATX 2.2 pinout (which also provides additional clues as to the electrical values of wire colors not listed on either Sparkle label). Hopefully a side-by-side of the four color-coded pinouts will serve as sort of a Fuel Power Supply Rosetta Stone.
Obvious differences between the WTX and Fuel Power Supply pinouts:
- Pin 3 in the WTX pinout is an orange wire listed as "3.3VDC Sense", the values for the brown wire connected to pin 3 of the SGI/Sparkle aren't listed on the label, but the ATX/EPS version of the Sparkle power supply (with the same FSP460-60PFN part number) piggybacks the brown wire into the motherboard connector with one of the orange +3.3VDC wires (ATX pinouts from other sources list the brown wire as 3.3V Aux)
- Pin7 is listed in the WTX pinout as "+5VDC (Aux)", the purple wire connected to pin 7 of the SGI/Sparkle is listed as "+5Vsb" (sb = standby).
- Pins 11 (PC), 12 (FAN C), 23 (PSON) and 24 (FAN M) aren't assigned specific wire colors or values in the WTX pinout, the colors and values used in the SGI/Sparkle connector most likely provide environmental monitoring of the power supply to the Fuel L1.
Note that the WTX and SGI pinouts for the eight-pin connector used to supply CPU power (labeled "P2" in the Sparkle power supply wiring bundle)
are different. The available photos of the SGI version of the Sparkle PS don't provide a clear view of that connector, so it hasn't been included yet. I'll update the post as soon as I have an opportunity to open one of the Fuels.
Please double check the values given in the table *and* the unlisted CPU power connector *before* attempting any to use an alternative power supply in your Fuel!!The chart visible in this post is a jpeg, if the text proves hard to read in that format, the pdf version attached should be easier to read.
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However there are several that included the output of "flash status" run against the L1 - which gives the same info for both L1 firmware images. 
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