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Multi rail psu question.

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  • Peripherals
  • PCI Express
  • Components
Last response: in Components
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February 4, 2014 9:57:37 AM

Ok so my psu has 1 x 20 + 4 pin connector 1 x 8 pin connector 1 x 4 pin connector 2 x peripheral Quick release connectors 4 x SATA (two Molex) 1 x Floppy 1 x PCI-E. The gpu I want to connect (gtx760) requires 1 x 6 pin PCI-E and 1 x 8 pin. Now the 4 pin on my psu comes out of (connected to) the 8 pin and I need the 4 pin for my CPU now I could buy an extender but this begs the question since there both on the same wires will this overload the rail rated at 16 amps since my CPU gpu combo would be technically on the same connector? Also I know I could use the molex if the above doesn't work out but doesn't that run on a 5v so the 15amps there wouldn't be enough would it?

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February 4, 2014 10:01:37 AM

that 8 pin cable is for CPU only. Its not even fitted the same way. You will need to either get another power supply or get a 4 Pin molex to PCIe 8 pin adapter.
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February 4, 2014 10:20:11 AM

drtweak said:
that 8 pin cable is for CPU only. Its not even fitted the same way. You will need to either get another power supply or get a 4 Pin molex to PCIe 8 pin adapter.

Thanks for the clarification, the gtx 760 comes with the 2 x Molex to 8 pin. So my last question would be in that config will it run off the opposite 12v rail that is powering CPU?
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February 4, 2014 10:24:21 AM

Why don't you tell us your PSU model ?
What to look for in a power supply
One of the most frequently asked questions when building a computer or changing /upgrading components is "how much do I need for a PSU". Without knowing what your components will draw as a whole and what you currently have for a power supply you can... See full content
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February 4, 2014 12:02:29 PM

gallovfc said:
Why don't you tell us your PSU model ?


Because I get a lot of guff for my choice in psu and from an electrical stance point the psu will work more then well. Its an rosewill rd450-2-SB, 2 12v rails one is a 16amp the other 14, 450 watt. My setup for reference is: i5 4430 (84 watts/7 amps) h81m p33 (not sure amps or what's here but I hear its usually between 10-50watts) 8gb 1600 MHz crucial ram (also unsure of actual watt/amp consumption) evga sc 760 (170 watts/14.16666666666667 amps) 1tb sata II hard drive and one 120gb pny xlr8 ssd. No optical drives running windows 8.1
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February 4, 2014 12:11:54 PM

that adapter will work. not sure how well the psu will hold up
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February 4, 2014 12:19:38 PM

A GeForce GTX 760 needs at least 30 amps on the 12v rail and a 500w power supply.

The Stallion is at the bare minimum to run a 760 , I would upgrade because the quality of the supply is also not very good.


It MIGHT run it , but not for long.
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