Powering a 6 + 8 pin GPU with 2x 6pin cables

NeuralGPU · Jun 22, 2016

I have AMD FirePro S9150 which has a 6 pin and an 8 pin power input. It uses 235 watts at max computing power. My rig is a Dell XPS 630i with a Dell D750E-00 PSU which is 750 watts. The PSU only has 2x 6 pin power cables.

Can I just plug in the two 6 pin cables to my GPU? will it work? do I risk frying the GPU?

Or can I use a 6 to 8 pin adapter?

hang-the-9 · Jun 22, 2016

I would spend $100 on a power supply with the correct power plugs for the card rather than risk damaging a $2,000 video card. http://www.newegg.com/Product/Product.aspx?item=N82E16817438017

It may work, and plenty of people that bought adapters have said it worked for them, but that was for people with cards like nVidia 970, not a workstation card that costs about 8 times more.

Math Geek · Jun 22, 2016

yup, is the same as buying a $1 mil Lambo and then dropping an engine for a yugo in it to save a few bucks. defeats the purpose of the shiny new car.

you bought the high end card, now get the high end engine to support it.

NeuralGPU · Jun 23, 2016

The situation is that some one bought a Dell PowerEdge R730 and the Firepro and never set them up. They donated them to us. The R730 did not have a enough watts in its PSU to run the card and they never bought the GPU installation kit which has the power cables.

We have ordered those parts from Dell but while we were waiting for them some one else gave us a NVIDIA Tesla k20 which we would prefer to put in the R730 because it can run CUDA and the FirePro can't. We could put them both in the R730 but I think there might be a driver conflict. Also there is a possibility of another k20 showing up for that slot.

I would like to get some use out of the FirePro but I'm just trying to see if any of our current equipment is compatible with it.

Math Geek · Jun 23, 2016

you have to populate both inputs for the card to work. so combining your 6-pins into an 8 pin covers that, but what about the 6 pin on the card? you've already used both 6 pins so they are out of the equation. so now you need some other type of adapter and hope that 2 molex or sata cables can be combined for the 6 pin connection. now you got this jumble of wires in there going all over the place and no one can be sure it will all work.

the good news is the adapters are cheap so won't cost much to try it out, but this level of jimmy rigging is not recommended at all. no guarantee that the psu can provide all the power to the right places to make all the combined efforts effective, if you follow me. these adapters do not create power, they only change where it comes from and where it goes. so if the psu can't provide the full power, then the adapter won't change that fact at all.

since the psu does not have the required connections, that tells me the maker of the psu knew it could not give the power, so they did not give you the connections. this is a big hint that it won't work!!

NeuralGPU · Jun 23, 2016

The PSU has 2 open 6 pin connectors. I ordered a 6 to 8 pin converter but am reluctant to experiment with it on a $2000-$3000 card. have you ever heard of some one damaging a GPU by using an adapter like this?

Math Geek · Jun 23, 2016

it probably won't run. a 6 pin gives 75w of power and an 8 pin gives 150w of power. so a simply 6-8pin conversion only changes the plug but it is only giving the 75w it is designed to give.

the card will probably not even run and may not let the system boot. that is why most adapters combine various cables. to try and get to the right wattage the plug is supposed to have. both 6 pins is needed to give the 150w an 8 pin supplies.

hang-the-9 · Jun 23, 2016

NeuralGPU :

As I said, people have said those adapters work, but that is on cheaper cards that may have a lot more flexible power input tolerances. It does not really matter if you can't find someone that has damaged a card with the adapter or not, do you want to be the first? If not, get a power supply with the right connectors on it already and get rid of the risk totally.

Smoking because your dad lived to be 90 and he smoked does not guarantee that you won't die at 40 due to lung cancer. Same thoughts with the power supply and your card.

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Powering a 6 + 8 pin GPU with 2x 6pin cables

NeuralGPU

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Math Geek

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NeuralGPU

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Math Geek

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NeuralGPU

Commendable

Math Geek

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hang-the-9

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