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R9 280x installing question

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  • GPUs
  • PCI
  • Graphics
Last response: in Graphics & Displays
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September 10, 2014 2:19:27 PM


Hello, I recently received my XFX r9 280x and have been encountering some issues during the installment of it. The main issue is figuring out what power connectors from the PSU to connect to the GPU.

Evidently the GPU requires a 8 pin connector and 6 pin connector (here is a picture) the GPU came with 2 different adapters for the PSU. One is a 6x2 pin to 8 pin (like this) and the other is a 2x molex to 6 pin (like this).

Would this call for a 6 pin pci and 8 pin pci to be plugged into it? If that is indeed the case the issue I'm running into is that I'm unsure what is what, my PSU seemingly has only 1 pci (red) cable but does come with an attachment for it that splits it into 2 (both are 6+2)(the one on the furthest right).

Now for my PSU, I have a Raidmax RX-630SS (630W)(info here and here). The PSU doesnt have a native 8 pin connector but it has an adapter for the 6 pin pci that allows for 6+2, I had kinda figured thats what goes into the 8 pin slot of the GPU the only problem is what then goes into the remaining 6 pin slot of the GPU?

Here is info on my rig
CPU: FX-8320
MOBO: GIGABYTE GA-970A-D3P
RAM: G.SKILL Ripjaws X Series 8GB (2 x 4GB)
SSD: SAMSUNG 840
PSU: RAIDMAX HYBRID 2 RX-630SS 630W 

Any help will be most appreciated, been pulling my hair out trying to figure this out.

Thank you!

More about : 280x installing question

September 10, 2014 2:30:35 PM

Looks like you will need to use your 2 PCI-e cables into the 8 pin adapter for your 8 pin plug on your card and you will need to use the 2x molex to 6 pin adapter for the 6 pin plug on your card.
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September 10, 2014 2:32:12 PM

You can use a 6+2 either as a 6 pin, by pushing the little 2 pin bit aside, or as an 8 pin by inserting both 6 and 2 pin parts together.
From the specs that unit has a single lead that plugs into the PSU which branches into two 6+2 connectors.
So you should: Connect the PCI-E lead to the PSU. Then connect ONE of the connectors on that lead to an 6 pin plug by pushing the 2 pin part aside and then push the remaining connector into the 8 pin plug by inserting its 6 and 2 pin parts together.
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September 10, 2014 2:33:37 PM

that psu shows --- PCI-Express Connector1 x 6-Pin, 1 x 6+2-Pin

so u use the 6 pin in the 6 pin and the 6+2 in the 8 pin of the card and your covered
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September 10, 2014 2:33:48 PM

Your psu should supply all the cables you need. You shouldn't really need any of the cables that comes with the gpu.
RX-630SS isn't a particularly good power supply to use. I would advise you to get one form Tier 1 or Tier 2 from this list.
http://www.tomshardware.co.uk/answers/id-1804779/power-...

But you could use the molex connectors to the 6 pin PCIE connector.
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September 10, 2014 2:44:37 PM

I use the 6 pin molex adapter on mine without issues. i did however have issues while testing the 8 pin adapter using the same card. Come to find out i possibly have a wonky rail, but it works fine for now till i upgrade the psu. try it out, you should be good to go, but i think the min recommended psu is 750watts. I have read guys running lower on it though.
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September 10, 2014 2:49:33 PM

use the 6 pin molex adapter

should not had to do that with that one card your psu got the right leads for it

pci-e slot = 75w 6 pin = 75w 6+2/8 pin = 150w for the card to be properly powered

so what is the molex putting to it ??? the right amount ?? under- over??

to me if the psu don't supply the card with its proper connections I would look at that as ''funny'' [opinion]
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September 10, 2014 3:25:29 PM

Thanks for the replies everyone. I managed to get the GPU to power (the fans are spinning, I used the 6+2 in the 8 pin on the GPU and I used the molex 2x1 6 pin for the 6 pin slot) but now my computer isn't posting. I also tried to put my old GPU back in and its not posting on that either.
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September 10, 2014 3:32:56 PM

''Choosing the right PSU is an important decision for the enthusiast because it is the backbone of any system. Buying an inferior, no-frills unit brings with it many consequences – some of which can be catastrophic. I’ve personally read of many stories of various individuals who have been strapped for cash and gone down this route, these cheaper units can often blow and when they do, they will take everything with it. So you may think spending all of your money on the core components like CPU, GPU, motherboard and then very little on the PSU is a good thing – this may change when it goes up in smoke!''
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September 10, 2014 4:23:50 PM

Yeah I completely intend to, the GPU was given to me as a welcome home gift and the PSU was a holdover from my previous build. I was planning to upgrade my PSU and get a HDD for storage with my next paycheck.

Computer still wont post a display with either GPU.
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September 10, 2014 4:29:17 PM

you seen what I said about the molex thing and all

''use the 6 pin molex adapter

should not had to do that with that one card your psu got the right leads for it

pci-e slot = 75w 6 pin = 75w 6+2/8 pin = 150w for the card to be properly powered

so what is the molex putting to it ??? the right amount ?? under- over??

to me if the psu don't supply the card with its proper connections I would look at that as ''funny'' [opinion] ''
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September 10, 2014 4:53:07 PM

I'm not even using the molex on my old GPU and it still isnt posting display on it.
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September 10, 2014 5:08:17 PM

well its down to the psu failed trying to run the card or something on the board failed -- I guess with out a back up unit your stuck till you get one to try
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September 10, 2014 5:44:58 PM

even with my old card where it worked fine? thats what I cannot understand, I put the computer back together like it was before and its not posting now, using the same parts it ran perfectly yesterday with
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September 11, 2014 5:28:34 AM

don't know I'm not there for a hands on but it may just be the new card that requires more from the psu may have been too much for it and now the psu may have went bad in some way??? as I said unless you can get another quality psu that can hang with the new card and test you now don't know
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September 11, 2014 10:23:44 AM

ah ok it is not posting. This reminds me of an old problem i had. Back in the day when i first started building my pc's i had this no post issue. i racked my brains trying to figure it out only to discover that there was a screw wedged behind the motherboard that was causing the built in fail safe thingy on the MB not to post or something. Got that screw out the way, put everything back together and it fired right up. i would say do this. take your system apart reclean everything while your at it with air, put it back together and only power up the needed components. Your MB, processor 4 pin and GPU, nothing else, no cd driver, keyboard, mouse, nothing that is not needed to run. Minimal power demand as possible is what we are looking for. See if it post and let us know
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!