Sign in with
Sign up | Sign in
Your question
Solved

powering graphics card.

Last response: in Graphics & Displays
Share
May 17, 2014 6:23:16 PM

I have a r9 270x that requires 2 six pin connections. right now I have been using a single cable coming from psu that splits into two pci connectors. Is this ok or should I plug a second pci cable into psu and have 2 pci cables going to graphics card?

More about : powering graphics card

Best solution

a b ) Power supply
a b U Graphics card
May 17, 2014 6:35:40 PM

If your PSU has 2 or more 12v rails then you want to split the load over them or if it has a dedicated PCI rail then use that plus 1 of the 12v rails. You need a 500w PSU which can output 24 amps, usually 1 rail will not be able to that that so the load must be split across multiple rails. There will be a sticker on the side of the PSU telling you how many 12v rails you have and what current output each will give. I hope that makes sense.
Share
May 17, 2014 6:51:37 PM

zink1701 said:
If your PSU has 2 or more 12v rails then you want to split the load over them or if it has a dedicated PCI rail then use that plus 1 of the 12v rails. You need a 500w PSU which can output 24 amps, usually 1 rail will not be able to that that so the load must be split across multiple rails. There will be a sticker on the side of the PSU telling you how many 12v rails you have and what current output each will give. I hope that makes sense.


I have a seasonic G series 750watt psu. this is whats listed on output -+3.3V@20A, +5V@20A, +12V@62A, -12V@0.3A, +5Vsb@2.5A
m
0
l
Related resources
a b ) Power supply
a b U Graphics card
May 17, 2014 7:01:32 PM

Cool then you are fine powering the card with the PCI cable you are using now. you can use the split PCI connectors without issue.
m
0
l
a b ) Power supply
a c 194 U Graphics card
May 17, 2014 7:15:31 PM

Even if it was multi rail, many if not most, will just separate mobo to 1 rail, cpu to another, pcie to another, etc., so may still not make a difference. You have to check with the design to make sure. Also power is distributed to whatever rail needs it and you don't get "trapped power." But you have a single rail so it makes no difference here.
m
0
l
May 17, 2014 7:20:45 PM

so in my case i can leave the one cable feeding 2 pci connections on graphics card or plug in 2 pci cables to the psu. either way no difference? is this due to the 12volt@62amp?
m
0
l
a b ) Power supply
a c 194 U Graphics card
May 17, 2014 7:25:58 PM

All the power is coming from a single source so it makes no difference what cables are connected to it.
m
0
l
May 17, 2014 7:31:38 PM

cool, thanks
m
0
l
!