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Brians256 · 11-07-2003, 01:34 PM

SWAG:

Method one: just jumper the secondary PWRON line to the +5V rail of the primary PSU. That way, when the first PSU is turned on, the secondary will be turned on too.

Method two: run both PWRON lines from the PSUs to a buffer chip if you can't tie them together. If the input impedance on those two lines is too high to be driven simultaneously by the mobo, that is. Tying them together without a buffer chip is easier but may not always work (I don't know what the typical current driving specs is on most mobos compared to the imput impedances of the PSUs you might be using).

11-07-2003, 01:34 PM	#2
Brians256 Pro/Staff Join Date: Oct 2001 Location: Klamath Falls, OR Posts: 1,439	SWAG: Method one: just jumper the secondary PWRON line to the +5V rail of the primary PSU. That way, when the first PSU is turned on, the secondary will be turned on too. Method two: run both PWRON lines from the PSUs to a buffer chip if you can't tie them together. If the input impedance on those two lines is too high to be driven simultaneously by the mobo, that is. Tying them together without a buffer chip is easier but may not always work (I don't know what the typical current driving specs is on most mobos compared to the imput impedances of the PSUs you might be using).