PCIe power cable, dual 6-pin to single 8-pin: does it exist?

[Jolio]

I've got a 2009 Mac Pro. I'm considering getting an AMD Radeon R9 Nano graphics when it comes out later this month, and I'm trying to figure out how I can power it. The card requires 175W, and a single 8-pin (150W) power connector. Problem is, each of the two PCIe auxiliary power outlets on the motherboard is 6-pin (75W).

I realize that plenty of people use 6-pin to 8-pin adapters, but I'd rather not if possible.

I'm wondering if there exists a dual 6-pin to single 8-pin Y-cable which would suit this purpose. I haven't been able to find one, does anyone know if they exist?

 

[SoyCapitanSoyCapitan]

Google 'dual 6 pin to 8 pin'

 

[Jolio]

Google 'dual 6 pin to 8 pin'

If only all of the internet were full of people as helpful as you. I never would have thought of that...

 

[EHuntington]

If only all of the internet were full of people as helpful as you. I never would have thought of that...

I would think the card would probably come with the adapter. In both my Geforce 680 and Geforce 780 packages, there was a dual 6pin to 8pin adapter. If not, they're readily available. Amazon Link

 

[h9826790]

If only all of the internet were full of people as helpful as you. I never would have thought of that...

But he is right, I follow his instruction, and able to know that cable exist within 5 seconds.

Anyway, please don't blame the others, the answer's quality is affected by your question's quality.

 

[SoyCapitanSoyCapitan]

On this forum our favourite new cable supplier is http://www.moddiy.com. They are based in Hong Kong, very cheap, very fast delivery. They can build any cable you want to any spec you want.

 

[h9826790]

I wish they can build a simple PSU mod cable for cMP. That will be a great news for us

 

[SoyCapitanSoyCapitan]

I wish they can build a simple PSU mod cable for cMP. That will be a great news for us

Well they do we just wish that our PSU was modular.

 

[h9826790]

I mean a cable as simple as an adaptor which connect to the mainboard connector and split the power from there. So that the whole process is reversible by simply remove the mod cable.

 

[Inutopia]

does anyone know if they exist?

They do exist, I use one in my MP. Got it on Ebay from Germany and it is EVGA branded.

 

[SoyCapitanSoyCapitan]

We don't yet have a clear picture if Radeon Nano is going to work, there are some hints though. But you will have to wait until after a Fiji sporting Mac hits the market. From what I gather the card is already with reviewers but they are under tight NDA until the 27th and AMD is working to make sure the drivers make the card a better purchase than a GTX980.

 

[Fl0r!an]

I'd definitely hold back getting any Fiji card. Not only OS X doesn't offer any drivers, but MVC even had problems starting his MacPro with a Fury installed.
I guess to reach the desktop in his post a few days ago he was using either a special 2nd card or prepared the Fury ROM somehow.

 

[MacVidCards]

Dual 6 pins to 8 are a dime a dozen, they include them in many GPU boxes. I've probably got 50 or 60 in my e-recycle box.

 

[fuchsdh]

Dual 6 pins to 8 are a dime a dozen, they include them in many GPU boxes. I've probably got 50 or 60 in my e-recycle box.

As I found when I needed them to deal with the power options off the Z840s at work, they're actually rather hard to find outside of that case (our GPUs are sweetheart test deals from Nvidia, so they didn't come with cables, and most dual 6 to 8 pin cables are for turning your 8 pin off the mobo into dual six pins, instead of vice versa.)

 

[Jolio]

But he is right, I follow his instruction, and able to know that cable exist within 5 seconds.

Anyway, please don't blame the others, the answer's quality is affected by your question's quality.

I did a fair amount of searching before I posted. I've since found a few, but they weren't readily apparent. I was hoping someone knew offhand, you know, save time and trouble? Seek expert advice?

I mean a cable as simple as an adaptor which connect to the mainboard connector and split the power from there. So that the whole process is reversible by simply remove the mod cable.

You mean a dual [6-pin Mini-Fit Jr.] to single [PCIe 8-pin]? That would definitely be the cleanest solution; even with the Y-adapter in question, I would still need two of the standard "Mac" PCIe 6-pin cables. I might solder such a cable myself, or check out moddiy, if I do end up going this route.

We don't yet have a clear picture if Radeon Nano is going to work, there are some hints though. But you will have to wait until after a Fiji sporting Mac hits the market. From what I gather the card is already with reviewers but they are under tight NDA until the 27th and AMD is working to make sure the drivers make the card a better purchase than a GTX980.

I'd definitely hold back getting any Fiji card. Not only OS X doesn't offer any drivers, but MVC even had problems starting his MacPro with a Fury installed.
I guess to reach the desktop in his post a few days ago he was using either a special 2nd card or prepared the Fury ROM somehow.

Definitely thanks for the heads up, both of you.

Dual 6 pins to 8 are a dime a dozen, they include them in many GPU boxes. I've probably got 50 or 60 in my e-recycle box.

I'm guessing this is why they're so hard to find separately. This is what I get for thinking too far ahead...
Oh, hey, while I've got you on the line, I've read your guides; they're great, but why can't I find 5.25" PSUs for sale anywhere anymore?

As I found when I needed them to deal with the power options off the Z840s at work, they're actually rather hard to find outside of that case (our GPUs are sweetheart test deals from Nvidia, so they didn't come with cables, and most dual 6 to 8 pin cables are for turning your 8 pin off the mobo into dual six pins, instead of vice versa.)

 

[h9826790]

You mean a dual [6-pin Mini-Fit Jr.] to single [PCIe 8-pin]?

I mean a direct connection to here.

This will allow more than one 8 pin cable draw 150W directly from the PSU.