2 Seperate PCIe cables on one GPU.

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Dapro_

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Dec 14, 2012
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Hi. I had my PC pre built with a 6 pin only GPU so they put a 6pin only PCIe cable in. Today I received my AMD 7970Ghz and it requires an 8 pin and a 6 pin, my PSU is qualified btw. So I took the 8 pin that came with the 7970 plugged that into a open 4 prong female power connector thingy and the GPU and the 6 pin that was already in (directly conned to the PSU) and plugged it into the GPU aswell. Now, is that ok? I haven't turned it on yet cause I'm scared something bad will happen. Thanks for the answers :D
 
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dwatterworth
That is totally fine. The worst thing that will happen is the GPU won't power on or will operate at reduced speed if there is not enough power supplied by the molex adapter. Should be totally fine most likely.
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iam2thecrowe

iam2thecrowe

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Jul 4, 2010
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no, the worst thing that could happen is he could overload the psu, blowing the psu and in turn damaging other components.
What are the specs of the PSU - Make : model : wattage rating : 12v amp rating? Make sure it meets your PC's power consumption requirements.
Ive never heard of a gpu running at reduced speed due to not enough power being supplied, unless a pcie power connector has been completely left out. The gpu draws the same power regardless of what is supplied, how is the gpu to know if its getting correct amps until it draws it........??. If not enough power is provided by the psu, it will either shut down if it has over-current circuitry, or it will overload causing it to fail.
 
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dwatterworth

dwatterworth

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I had two Nvidia 9800+ cards in SLI and received graphic warnings in windows that the GPU was not receiving enough power and would operate at fractional speed, all cables were connected.

I was going off of Dapro_ saying his PSU was qualified. Are you kidding on the hardware 'not knowing' if it is getting enough power? All these things do is monitor their own power states.
 
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iam2thecrowe

iam2thecrowe

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Jul 4, 2010
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If you ever get the message "not enough power available" then there is something wrong with the way you connected the power connectors or motherboard power over the bus, and the card is not detecting the correct input voltage or is not detecting any voltage where it should be. It is not measuring the amperage/wattage the PSU can supply.
 
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dwatterworth

dwatterworth

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Oh I misunderstood your reply. Right, the GPU can't see what the PSU can supply but if the PSU was on the certified list, it probably won't overload the PSU. I believe the GPU throwing the error in my case was the secondary. It was connected with two separate modular connectors from the PSU, as was the primary, so the cards can report insufficient power while still functioning.
 
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