One Cable or Two ?

[XCLx321H]

Sirs, I have a question, When installing the GPU (PCI-E / 8Pin and 6Pin) do I use just one Supplied Cable (the RM-850), Or Two ? My other machine uses Two separate Cables (Two 6Pins). Thank you for taking the time to read this. It means a lot to me, Thank you, Any answer's would be great.

[SpDFrek]

Depending on your GPU you can use the single cable with two connectors, but it is recommended to use two separate cables for each connector on the GPU.

[XCLx321H]

Sir, Thank you for the re-ply that sure was quick. I'm using one single GPU, an ASU.GTX -770 with a 8Pin and a 6Pin connector, on a SBT Z87 MBoard. Will one PCI-E Cable (on the RM850) be enough to Power the GPU ? Thank you Again....

[jonnyguru]

Single cable should be fine.

[XCLx321H]

Sir, Thank you for the positive reply, these Forums are about the only place were I can get Info and Answers. Like I say It means a lot to me. Thank you...

[Ahtlon]

You can use the single or the 2 separate ones , I thought that the RM850 has a single rail line, so the GTX770 should get enough power with the single cable with 6+2 + 6+2. I prefer the 2 separate ones, looks nicer and cleaner.

[jonnyguru]

You can use the single or the 2 separate ones , I thought that the RM850 has a single rail line, so the GTX770 should get enough power with the single cable with 6+2 + 6+2. I prefer the 2 separate ones, looks nicer and cleaner.

 

It's not so much as the current AVAILABLE at a particular cable, but how much stress you put on a single connector. If you use two connectors on one cable, obviously there's more resistance at the modular connector at which that cable is plugged in.

 

That said, a GTX770 isn't going to push that single connector to the point of concern. An R9 295X2, on the other hand..... ;)

[Xaero]

It's not so much as the current AVAILABLE at a particular cable, but how much stress you put on a single connector. If you use two connectors on one cable, obviously there's more resistance at the modular connector at which that cable is plugged in.

 

That said, a GTX770 isn't going to push that single connector to the point of concern. An R9 295X2, on the other hand..... ;)

 

That is proper bro science dude. The pcie cables on any decent manufacturer PSU is using 1.25-1.50 square mm cables, which i believe equals to gauge 16. A gauge 16 cable can carry 20 Ampere and aprox 1000 watts at 12v. Considering the most power hungry graphics cards on the market is maxing out at around 350watt, you have a 60% over capacity on a single cable. So no, using a single Y-cable compared to using 2 separate cables makes no difference at all.

[red-ray]

That is proper bro science dude. The pcie cables on any decent manufacturer PSU is using 1.25-1.50 square mm cables, which i believe equals to gauge 16. A gauge 16 cable can carry 20 Ampere and aprox 1000 watts at 12v. Considering the most power hungry graphics cards on the market is maxing out at around 350watt, you have a 60% over capacity on a single cable. So no, using a single Y-cable compared to using 2 separate cables makes no difference at all.

 

:beatchair What about the pins in the connector? What is their current rating?

 

I know about software rather than hardware but looking at https://en.wikipedia.org/wiki/Molex_connector it specifies The 1.57 mm pin can carry 5 A of current, while the 2.36 mm can carry 8.5 A. The PCIe cable pins are 1.57mm and 12 x 5 x 4 = 240 watts :nodding:.