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Using 12V HPWR to power 3 x 8 Pin PCIE 7900 XTX

Richie

Richie

Richie

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rare said:
Why not just run it off the 3x 8 pins on the PSU?
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I was thinking it will be a little neater than 3 seperate cables.

I know I can get a bridged 8+8+8 PCIE cable on each end which can help as well but thought a single connector on the PSU end would be a little bettr.
 
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muon said:
Much better. Yes I was doubting their existence outside of some random Chinese manufacturer.
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In all honesty I am not sure if that's a triple PCI-E from the PSU to 12VHPWR on the GPU rather than the other way around.

At the end of the day, the cable is just a cable but I wonder if the GPU would work from a 12VHPWR feed off the PSU which is then split into 3 x 8 pin PIC-E... Then again, if 3 x PCI-E can power a 12VHPWR card, then why couldn't a 12VHPWR PSU supply run a 3 x PCI-E card (common sense says it should be sufficient) :confused:
 
Seeing as both the cables are made for Nvidia GPU, i don't think i would take the chance that it will work for AMD GPU.

I understand what you are saying about a cable is just a cable, but i would just use the 3 x 8 pin.
 
muon said:
And you trust a cable where the manufacturer isn't even willing to put their name against it? A 450W cable MODDIY are selling sourced from a random in China.

edit: Just noticed they've called it 600W. An 8 pin PCI-E cable only officially supports 150W.
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That's original spec but the 850+ PSUs from the various brands I used have 300W per PCI-E output these days which is how the 2 x PCI-E to 12VHPWR to cables work.

As the PSU has 3 x PCI-E outputs 3 single cables would be another option if it was a question of cleaner cables at the GPU end.
 
IMO you would have to be very brave or foolish to voluntarily use 12VHPWR for a card which doesn't force you to.

I'm still unsure what actual problem 12VHPWR was meant to solve and so far it seemed to have cause problems which the old 12V 8pin did not have.

Oh yes, side from aesthetics which seems a poor reason. If a card can pull the full 600W of 12VHPWR, I would trust 4 x 12V-8 pin far more than one tiny cable.
 
bimbleuk said:
That's original spec but the 850+ PSUs from the various brands I used have 300W per PCI-E output these days which is how the 2 x PCI-E to 12VHPWR to cables work.

As the PSU has 3 x PCI-E outputs 3 single cables would be another option if it was a question of cleaner cables at the GPU end.
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They split into 2 x PCIE on the other end though. They dont try and push 300W through one connection.

An EPS 8 pin for example does support 300W. So it is possible on the PSU side using a custom pin out (or even just EPS). Or in the OPs case a 12vhpwr connection.

But if that terminates to 3 x PCIE, you cant have 600W. A well built GPU wont try to pull that much over 3 connections either, as its own OCP protections will kick in.
 
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Some manufacturers specifically supply cables with their ATX 3.0/PCIE5 PSUs with 2 PCI-E 8 pins, because they don't provide many ports in their modular PSUs, but there's no way I'd be deliberately using a 12VHPWR connector for a card that doesn't even require it, especially if I had the cables available to plug it in directly.
 
bimbleuk said:
I have Seasonic & Corsair 12VHPWR cables that state 600W from 2 x PCI-E. In practise I haven't measured but still rated.

www.overclockers.co.uk

Corsair PCIe 5.0 12VHPWR Type-4 PSU Power Cable (CP-8920284)

Order Corsair PCIe 5.0 12VHPWR Type-4 PSU Power Cable (CP-8920284) now online and benefit from fast delivery.
www.overclockers.co.uk www.overclockers.co.uk
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That's on the PSU side though. Corsair can design that side however they want.

PSU manufacturers often build that side to accommodate cables which split into 2 x PCIE 8 pin from a single connection. Or in your case using 2 of them into a 600W 12vhpwr connector. It won't be a standard PCI-E pinout. It is why you can't use just any cable on a modular PSU.

On the GPU side it is completely different and would have to use a standard pinout.
 
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KompuKare said:
IMO you would have to be very brave or foolish to voluntarily use 12VHPWR for a card which doesn't force you to.

I'm still unsure what actual problem 12VHPWR was meant to solve and so far it seemed to have cause problems which the old 12V 8pin did not have.

Oh yes, side from aesthetics which seems a poor reason. If a card can pull the full 600W of 12VHPWR, I would trust 4 x 12V-8 pin far more than one tiny cable.
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I dont think the OP is trying to plug the 12vpwr into the gpu,he's just using it from the psu and then sticking an adaptor on the end to give it normal ouput. The 12vpwr wpuld be a lot easier to guarantee a safe connection when it isnt attached to the gpu.

The only problem the 12vpwr sorted was that it's now a little more of a fuss to switch to a diggerent gou brand. It was a way of locking people into nvidia, im not sure they needed to do that anyway.
 
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I honesty wouldn’t bother. It adds an unnecessary connection in the chain. You can easily tidy three PCIe cables so they are very neat.
 
D1craig said:
I dont think the OP is trying to plug the 12vpwr into the gpu,he's just using it from the psu and then sticking an adaptor on the end to give it normal ouput. The 12vpwr wpuld be a lot easier to guarantee a safe connection when it isnt attached to the gpu.

The only problem the 12vpwr sorted was that it's now a little more of a fuss to switch to a diggerent gou brand. It was a way of locking people into nvidia, im not sure they needed to do that anyway.
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I sort of got that.
But while (most) PSU manufacturers don't combine multiple PCIe 8-pins into one connection at the PSU end, sure as long as the supply has 3 or so of the PCIe 8-pin modular connectors beside each others, then I if the look is so important then why not just get a sleeve to wrap them? That way all but maybe 60mm or so the cable are all "together".

Although... 450W to 600W at 12V DC - while not coiled so shouldn't cause any induction - but 50A between all those wires... is it actually wise to have them close together?
 
Sorry if I'm being incredibly dense.... but surely you wouldn't even be able to plug the cable into the card as the 3x 8pin connectors would be female, but you'd need male connectors to plug in to the female connectors on the GPU?
 
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