laptop motherboard and desktop graphic card to one power supply

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Anthonyds

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Mar 31, 2015
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I planning build desktop, I have laptop motherboard and desktop graphic card together. What both connector only one power supply?

I have laptop motherboard from old Compaq laptop and desktop graphic card is NVIDIA GeForce 7900 GS, I build both together will work. I don't want use two power supply, how use only one power supply?
 
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norsestar

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Apr 8, 2014
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Without asking the question of why you'd want to do that, what voltage does the motherboard want from its adapter? Assuming it's in the 12-20V range, I'd try feeding it 12V from the GPU's power supply. 12V should be enough for the motherboard's voltage converters (at least in the ones I've seen; the nominal 19V is only needed to charge the battery).
 
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norsestar

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Apr 8, 2014
339
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You'd need 4 separate 5V power supplies. All the 5V leads on a single PSU share a common ground so you can't stack them in series.

Are you actually trying to charge a laptop battery with this? If not, it should work with 12V as this is about what it gets when running on battery power.
 
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