Pcie cables, run two? or use the split?

champ222

champ222

champ222

Associate
Joined
19 Aug 2005
Posts
1,446
Location
Beds, UK
Hi All

Usually when a gpu has two power connectors, i run two cables from the psu. The cables usually have two plugs on, one linked from the other, so the other ones just sit there looking untidy, but its how ive always done it.

I bought a pc from a friend and he had run one cable from the psu, and plugged both connectors into the two sockets on the GPU. He has lost the remaining power supply cables.

So should i source another cable for the psu? Corsair RM650, or just use the one cable? It seems to be working fine. The GPU is a Vega 64, but that is subject to change.

What do you do?

Cheers
 
Fine for the Vega, and you could argue that anything you’re running on a 650 watt PSU would be fine too.

The idea of running two different cables is that you’re splitting the lid on the cables and rails (if there are multiple). This can help with overclocking, but from memory, the thing to do nowadays is undervolting.


I’d probably not bother with the hassle.
 
It's nothing to do with splitting the rails (most psu's are single rail now anyway) and everything to do with ensuring that the card doesn't draw too much power down a single cable. This started happening when Vega launched as they are very power hungry cards,especially the 64 and people were experiencing instability and crashes. It was found to be happening only when people were using a single cable with the pair of connectors on it. Those that used a pair of seperate cables had no problems and nor did those that had problems once they swapped to a pair of single cables. So yes, use a pair of seperate cables for your Vega 64. It is also worth checking the very useful Vega thread in the Graphics Card section as there are loads of tips for undervolting (which actually lets the card run faster) and other tweaks.
 
Thanks guys

Ive done it, as it seemed like the logical thing to do. I had one of the early corsair HX power supplies that claimed three 12v rails... turns out it was only two when the proper reviews came out. They didnt tell you what was connected to which rail anyway, so wasnt much help. I'll see if i can track down the right cable. Custom cables seem pretty pricey.

I'll try and find that vega thread too, sounds like a good read.

Cheers

Thanks
 
Vega 64's power save profile is quite frugal by today's standards, but for default configuration you definitely want two separate power cables.
 
My 1080 won't even boot with a single cable plugged in from the psu and split. Its always had to have two separate cables. It is annoying having the split cable dangling there doing nothing though.
 
You must log in or register to reply here.
Back
Top Bottom