Help with - Dual PSU set up.

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sonicrang4r

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Aug 26, 2013
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Hey guys im currently helping a friend with making the most "ghetto" gaming PC ever (hope i didnt offend anyone) as we are trying to keep cost to an absolute minimum,
I have my dell optiplex which is just sitting there doing nothing, Since i got a new GPU Im attempting to put my old gpu 7950 into that computer, I will be powering the gpu separately with 460w PSU.

My question is:

In my 460w PSU there is only 2- 6pin connecters. My graphics card needs 1 8pin and 1 6pin, should i get a 6pin to 8 converter, im scared that something will short fuse, is there like a 6pin + 4pin - into 8 Pin connecter just so that is has enough power running through the cable or am i worrying a bit too much.

also just to be on the safe side, is this the right cable to attach to the motherboard when running a dual PSU set up so that the second PSU turns on.
http://www.amazon.co.uk/dp/B00P7835TI/ref=sr_1_fkmr0_1?ie=UTF8&qid=1437170123&sr=8-1-fkmr0&keywords=Dual+PSU++24+Pin+2-way

Thanks
 
Solution
geofelt
I would not do that.

Simply replace the dell psu with a proper 500w or better psu.
What make/model of 460w psu do you have?
If it is of excellent quality and has both a 6 and an 8 pin power lead, it might suffice.
If it is of poor quality, do not use it regardless.
I suspect poor quality if it does not have those leads.
A quality 460w unit like Seasonic will have two 6+2 leads and deliver 38 12v amps.
The danger is not that a cheap psu won't deliver power. A cheap psu will not have the protective circuitry that keeps from damaging your other parts if it fails under load.
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geofelt

geofelt

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Oct 9, 2006
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I would not do that.

Simply replace the dell psu with a proper 500w or better psu.
What make/model of 460w psu do you have?
If it is of excellent quality and has both a 6 and an 8 pin power lead, it might suffice.
If it is of poor quality, do not use it regardless.
I suspect poor quality if it does not have those leads.
A quality 460w unit like Seasonic will have two 6+2 leads and deliver 38 12v amps.
The danger is not that a cheap psu won't deliver power. A cheap psu will not have the protective circuitry that keeps from damaging your other parts if it fails under load.
 
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Solution
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sonicrang4r

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Aug 26, 2013
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I know about having a good (safe) PSU, the 460w PSU is from my dell XPS 8700 system, i used it to power my PC when i was using a 660, and it handled everything pretty well, therefore I think i trust it and since it will ONLY be powering the graphics card i think that should be fine, the PSU in the dell optiplex will be one that desktop came with.

I just wandering if the 6 pin to 8 pin might short circuit if the graphics card was drawing too much power, even though the 460w dell PSU will be solely used for powering that GPU
 
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sonicrang4r

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Aug 26, 2013
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I have been watching some Youtube videos and it seems simple enough, just add the graphcis card into the computer, make sure the 2nd PSU is giving power to the graphics card and is working fine, and also make sure you always turn on 2nd PSU (powering the graphics card FIRST) then turn the computer on as normal.

If im missing anything please tell me
Thanks
 
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geofelt

geofelt

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Oct 9, 2006
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A gtx660 only needs a 430w psu.
If your 460w psu does not have a 6 and a 8 pin connector, you may not have sufficient amperage to do the job.
Using adapters may function, but if your 460w psu gets overloaded, it can fail, damaging parts.
Look on the spec panel and see how many amps or watts it can deliver at 12v.
The 7950 can draw up to 300w, or 25a on the 12v rails.
If the psu can deliver 25a and a bit more for safety, you should be ok.
But... a cheap psu will overstate those numbers and may be talking only about peak performance, not continuous.
 
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sonicrang4r

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Aug 26, 2013
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I have added a link to the image of the information on the dell PSU, if you can see if its oke to run the card with a 6pin to 8 pin adapter safely - http://imgur.com/gallery/3o7xQtB/new
 
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