smj wrote:you might want to check out this thread on Fuel PSUs for general info and possible alternatives.
and even more in this document: http://ww1.microchip.com/downloads/en/A ... 00764b.pdf Whether or not the Sparkle or any of the other Fuel power supplies provide (or use) any of these optional ATX signalling functions remains to be discovered.ATX Optional Power Supply Connector signals perform the following functions:
FanM is a 2-pulse/revolution signal generated by the power supply fan that notifies the system of current fan speed. If this signal drops, the motherboard realizes immediately that the power supply fan has failed, and can shut down the system in an orderly manner.FanC
FanC is an optional signal generated by some motherboards to control fan speed for power supplies that are designed to allow this. The signal can range from 0VDC to +12VDC. A signal of +1V or less is recognized by the fan as an order to shut down, and a signal of +10.5V or more is recognized as an order to run at full speed. Intermediate voltage levels, which are supported by some motherboards and some fans, allow the system to instruct the fan to run at some intermediate speed. If this signal is left open (0VDC), properly designed fans run at full speed.Sense
This is a supplementary +3.3VDC remote sense line, which allows the power supply to monitor the actual voltage at the motherboard connector of the nominal +3.3VDC rail and adjust it to stay within specifications.
recondas wrote:But it might also be possible that j-j's pre-production prototype Fuel didn't include a PS with ATX2.1 fan and power monitoring capabilities.
jan-jaap wrote:I googled a bit for the NMB PSU. It looks like it was also sold as the 'it002a430wsw' for the Tyan S2603 dual Xeon board.
It seems the it002a430wsw is a WTX PSU, a larger form factor for e.g. dual Xeon boards. Pinout of WTX is different but ATX-WTX adapter cables exist(ed).
Of course no guarantees that (1) the SG002a430wsw is WTX and/or (2) that a reverse WTX-ATX cable would enable an ATX PSU to work in a Fuel.
Thanks for the offer, but based on some of the nekochan discussions (linked above) on the use of standard ATX power supplies, the answer seems to be the Fuel won't run (or even attempt to power up) without an active connection that reports the power supply fan speed/status (and possibly other bits of feedback from the PS).astouffer wrote:If the extra pins are for fan monitoring/data lines will a fuel run without them? I'd go as far as making a small adapter for normal ATX supplies if there is a market.
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