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Power and cable question

Karen Lynn
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I've an MSI R9 390 8GB.
 

I also have a Corsair 850W PSU, with 70a on the +12v rail.

 

It claims it's rated for SLI/Crossfire, but only has two PCI-e cable ports, and runs two 6+2 pins on each cable.

 

Is it safe, and/or reasonable, to run my R9 390 off a single cable, using the 6pin and 6+2pin from the same cable?

Unapologetic AMD fangirl. Yes, I'm biased. Yes, I know sometimes nVidia and/or Intel is an equal or better option. Yes, I try to keep it in check.

I still like AMD more.

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Just now, Electronics Wizardy said:

Its fine to use one cable.

Good to hear. Is it sub-optimal?

Unapologetic AMD fangirl. Yes, I'm biased. Yes, I know sometimes nVidia and/or Intel is an equal or better option. Yes, I try to keep it in check.

I still like AMD more.

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