Corsair RM750x (2018) PCIe connectors

[alexleon]

Could someone point me out which exactly are the [strike]slots[/strike] connectors for PCIe because im really confused. Its the Corsair RM750x (2018).

 

[camieabz]

There are three PCIe ports (8pins) in total (top row - right):



Any can be used for either 6+2 or 4+4 cables. You should have been supplied with 2 cables of the 6+2 variety and one of the 4+4.

Some motherboards and graphics card requires 4, 6 or 8 pin PCIe connections. Use what the card / mobo maker recommends.

 

[alexleon]

Thanks for the fast reply, really appreciated. Mine is the 2018 version and the slot layout is kinda different. Could you tell me on this psu how things work ?

. That gap between the 4 (8pin)slots down right is really messing my mind up. Are all those pcie slots ? Or just the 2 corner ones ?

 

[camieabz]

Looks like it. They are upside down, compared to the other version (or the right way up, if you prefer ).

 

[Karadjgne]

The ports with 6 slots are the peripheral/Sata, the ports with 8 slots are the pcie/eps. The mains is the 2x larger top right ports. Either way, that'll be decided by the cables, they'll say which is which on the connector and you won't be able to put an 8pin pcie in a 6pin Sata, or vice versa, the pin settings are proprietary.

 

[alexleon]

Thanks alot guys. Seriously.. I was about to go buy another psu thinking it had only 1 pcie left for my gpu (while my gpu needs 2). You saved me

 

[Karadjgne]

Unless I'm mistaken, the cabling of these new Corsair's is a single cable but has dual connections on the component side, so should be 2x 6+2pin on a single cable.

 

[alexleon]

You are totally right with that. But im getting the evga 1080ti ftw3 which needs a max of 280 wats. Im planning to use 2 cables because I Think its too much load for just 1 cable and it would be better to divide it into 2 different cables. What is your opinion about it ? Yey or nay ? Thats mostly the reason I started this thread because I didnt want to really use just 1 cable coming from 1 pcie slot of the psu.

 

[Karadjgne]

If the card only pulled from the psu, then with 280w ID be using 2x cables. But you are not including the pcie slot which can supply upto @90w (75w statistic), so with only a 200-280w demand, just 1 cable should be fine.

You can always test it yourself. Run a heavy gpu load program like msi kombuster or firestrike etc and get the gpu good and running hard. Then stick a finger on the cable, right at the psu connection. If you feel it's far too warm to touch compared to the other cables, then the gpu is pulling too much directly from the psu, so go ahead and use 2x instead. Statistics say a 8pin(6+2) pcie is good for 150w, that's just an assumed general usage. The connectors are actually good for 180w. So you do have plenty of physical leeway on a single cable.

 

[alexleon]

But why not use 2 cables from the beggining just for the peace of mind. Or I lose something in terms of power efficiency/distribution? Im not very familiar with these things and as I see you know your way arround these kind of stuff really good. Im gonna go with whatever you suggest.
Your call

 

[Karadjgne]

Heh, no. All power comes from 1 source. The 12v rail. Inside the psu, every one of those yellow 12v pins all leads back to one single point. So there's no power loss at all from distribution.

Whether you use 1 cable or 2 is upto you, Corsair, Evga and others have just daisy chained the connectors into a single cable for convenience and looks. Your psu is well capable of supporting sli/crossfire (older cards) with 4x 6+2pin connectors and having 4x cables with 4x connectors at the psu was always a mess. If you look at older designs of large psus, the modular connectors on the psu took up the entire back of the psu, which made internal configurations a nightmare of jumpers and buss feeds, with daisy chaining half of those connections are gone, far easier to work with now. Same for wiring in the case, much easier to deal with just 1 cable to the gpu, than 2,cheaper on sleeving or extending, cleaner looks with the short bump from 1 connector to the other etc.

It's up to you, either way won't be an issue, if you sli the cards you'd be running both cables anyway, and still using just 1 cable for 1 card.