Pcie power sharing

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solakug

Reputable
Jun 27, 2014
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4,510
So i recently upgraded my GPU, went from a r9 280x needing 8+6pin pcie power connectors to a gtx970 needing only 8pin power.

Now i'm wondering, i've had a asus rog xonar sound card being powered by a double molex to 6 pin adapter. Hideous. I'm wondering if the now dangling extra 6+2pin could be plugged in to my sound card to dispose of that molex adapter.

I've never seen anyone plug 2 different cards onto one single pcie cable and i'm wondering if it is doable without risks

Thanks for your help
 
Solution
nukemaster
I am sure there us not harm in trying. The adapter just feeds the card 12 volts. I am not even sure why the card needs extra power(older ones used a PCI to PCI-e bridge, maybe this does similar, but i do not see a bridge chip).

All the grounds and 12 volt lines go back to the same place on most power supplies(rails are split by current limiters).
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nukemaster

nukemaster

Titan
Nov 23, 2004
19,626
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74,965
I am sure there us not harm in trying. The adapter just feeds the card 12 volts. I am not even sure why the card needs extra power(older ones used a PCI to PCI-e bridge, maybe this does similar, but i do not see a bridge chip).

All the grounds and 12 volt lines go back to the same place on most power supplies(rails are split by current limiters).
 
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Solution
K

kraelic

Distinguished
Feb 12, 2006
940
1
19,360
The cable should be capable of reliably supplying a single card with two 8 pin connectors, or two separate cards with 8 pin connectors in sli/crossfire. Since the sound card is 6 pin you wont be maxing out the amperage for the line. If you tried to use y adapters to get more connections (from 2 up to 4) from that single cable then you run into issues.
 
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