Hazard?! Splitting 6+2 pin PCIe cable to 2 x 6-pin cables to power R9 270X

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garethccc

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Apr 23, 2014
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I have a Sapphire R9 270X Vapor-X card that has been serving me well for the past year or so. In the process of looking into tidier cabling options for my Elite 130 build, I came across a post warning people that due to the 150W rating of PCIe [strike]6-pin and [/strike] 6+2-pin cables, one shouldn't power a dual PCIe 6-pin card like the R9 270X out of one 6+2 PCIe slot on the PSU, even if it's physically possible to do so.

I've read that this card, under load, can pull in excess of 350W. So how exactly has my system remained stable playing games like Crysis 3 and running 3DMark when I'm committing the exact 'sin' detailed above? Have I just been extremely lucky or what? I'm using a Corsair CS550M semi-modular PSU.

See photos here and here for the cable setup I'm currently using to power the card.

Thanks!!
 
Solution
madmatt30
A 270x can't pull more than 180w mate.
An 8 pin is capable of 150w,the PCI slot is capable of another 75w.

So no,while adapters aren't really recommended ,you're not at any kind of risk at all.
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garethccc

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Apr 23, 2014
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Thanks for the reply... so 180W huh. Good to know. Obviously misinterpreted the power numbers that Hard[OCP] gave for the card (must have been total system draw). Do you know of any flexible aftermarket sleeved cables that would achieve the 6+2 --> 2 x 6-pin link I'm using here? The existing cables are super stuff and rediculously long (75cm!)

Cheers
 
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Cazalan

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8-pin is rated for 150W
6-pin is rated for 75W

There should be no issue splitting an 8-pin into 2x 6-pin.
Splitting a 6-pin into 2x 6-pin would be a no no.

That ~350W cited in the review is the full system load, not the GPU alone.
 
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garethccc

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Apr 23, 2014
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Thanks Cazalan, yes it seems like I got the figures wrong (thank goodness), thanks for confirming that the 6-pin split is okay in this case!

 
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