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Important question about 3090 power delivery and certain motherboards

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ElliotKehler
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2021/11/27 14:09:13 (permalink)
Hello! I have a question regarding the power delivery to my RTX 3090 XC3 Ultra Hybrid.
 
Explanation for my uncertainty: (Especially important segments are highlighted)
I have plans to upgrade to the new Z690 platform, for which I of course have to change motherboard. Currently, I have an MSI X399 Gaming Pro Carbon AC motherboard with a Threadripper 1950X CPU. This is powered by a Seasonic Focus GX 850W.
My graphics card is of a model with 2 PCIe connectors. It gets power from these, and through the PCIe slot it is in. The motherboard ↑ has, along with 2x CPU 8 pin and 1x 24 pin, also the unusual 6 pin connector which according to the manual provides power to the PCIe devices.
 
Going by official specifications (which I know are somewhat contested), 2x 8 pin + the PCIe power gives the graphics card 375 watts to utilize. This is sufficient for the 350 watt specifications for the card. If I remove the 6 pin connector from the motherboard and start a game, it does not take long for the computer to shut itself down, and only a power supply reset allows it to start back up. Supposedly, all motherboards can provide 75 watts through the PCIe slot, yet most do not have this 6 pin connector, meaning that the slot can get power without it. 
 
It is unlikely for EVGA to have manufactured a card only fully compatible with very rare motherboards, so my question is this: Does my current motherboard not provide PCIe power without the 6 pin connector, or does my graphics card pull more power than what 2x 8 pin + PCIe slot can provide (thus requiring this extra 6 pin)? It is not overclocked, it is even currently undervolted. If it indeed does draw too much power, can I then simply not use most Z690 boards for my upgrade, or is there something else to this that I am missing?
 
Please ask for any additional information, thanks! 
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    ty_ger07
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    Re: Important question about 3090 power delivery and certain motherboards 2021/11/27 15:44:46 (permalink)
    You should not need a 6-pin connector plugged into the motherboard for the video card to operate.

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    rjbarker
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    Re: Important question about 3090 power delivery and certain motherboards 2021/11/27 18:46:09 (permalink)
    ty_ger07
    You should not need a 6-pin connector plugged into the motherboard for the video card to operate.



    Yeah those additional power plugs (some are molex) were provided for running multi gpu...although on my current set up Im using it....anything that provides "any" power I plug it in.

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