Attaching PSU cables correctly

[Elbow]

Currently building a computer with 9700k, 1080ti, Z390 Aorus master and Corsair HX850 and had a couple of questions regarding the PSU cables.

 

1. The PCI cable has 2x 6+2 connectors, does it matter which one of them goes on which of the two 8-size jacks on the GPU?

2. MOBO has two 8-size jacks close to the CPU which I assume has to be for it, do I need to connect two 8-size CPU cables to them if I want to overclock or is it enough with one and if so, does it matter which of the two jacks I put it in?

3. PSU has its jacks marked as shown in this image which I assume has different voltage levels, are the three jacks below the 2 8-size PCI & CPU jacks also capable of having CPU and PCI cables? Since if I need another jack for a second cable to CPU then it should be one of the ''right'' ones yeah?

 

Sorry for the noobish questions, second computer I've ever built and last one was five years ago so pretty rusty

Spoiler

 

[Fasauceome]

8 minutes ago, Elbow said:

The PCI cable has 2x 6+2 connectors, does it matter which one of them goes on which of the two 8-size jacks on the GPU?

Nope, any 8 pins will do.

[minibois]

1. so you have two PCIE 6+2 pin connectors on your GPU and a cable with two PCIE 6+2 pin connectors? Just plug in either into either spot. Doesn't matter otherwise.

2. The 8 pin/4+4 pin (EPS) connectors are CPU power and the second one will mostly go unused, unless you're overclocking or running a particularly high-clocked CPU (like one of those new i9's). So... it depends. One of these 8 pin cables can supply 150W, but some of those new CPU's can draw quite a lot of power.

3. If I'm understanding your question correctly, you're asking if the 5 "6+2 PCIe & 4+4 CPU" connections on the motherboard can be used for that purpose? Yes. The PSU should come with a bunch of cables included (is this an RMX unit? Because 650W+ should come with 2 PCIe cables, both with 2 PCIe 6+2 pin connectors and 1 8 pin EPS cable). 

[Elbow]

3 minutes ago, fasauceome said:

Nope, any 8 pins will do.

 

3 minutes ago, Minibois said:

1. so you have two PCIE 6+2 pin connectors on your GPU and a cable with two PCIE 6+2 pin connectors? Just plug in either into either spot. Doesn't matter otherwise.

2. The 8 pin/4+4 pin (EPS) connectors are CPU power and the second one will mostly go unused, unless you're overclocking or running a particularly high-clocked CPU (like one of those new i9's). So... it depends. One of these 8 pin cables can supply 150W, but some of those new CPU's can draw quite a lot of power.

3. If I'm understanding your question correctly, you're asking if the 5 "6+2 PCIe & 4+4 CPU" connections on the motherboard can be used for that purpose? Yes. The PSU should come with a bunch of cables included (is this an RMX unit? Because 650W+ should come with 2 PCIe cables, both with 2 PCIe 6+2 pin connectors and 1 8 pin EPS cable). 

It's a 850W platinum, got it if I want to buy a second GPU in the future.

 

Guess I got all the answers I needed then! Was 90% sure that was the case but scared of the remaining 10% being ''oh my god you retard you put the wrong cable at the wrong place now this 3K computer is going to burn up fucking dingus''.

 

Rather be safe than sorry!

[mariushm]

The connectors are keyed so you can't plug them incorrectly.

 

You can use a single cable and use both pci-e 6+2 pin plugs to connect the video card (if your power supply comes with such a cable) or you can use two separate cables and use just one pci-e 6+2 pin plug from each cable. 

Technically, it's just a bit better to have more wires between the video card and the power supply, but your system will work just fine if you use a single cable.

 

Minibois is incorrect when it says the CPU cable can carry 150 watts. The 150w number is an artificial limitation of the pci-e standard, and applies only to pci-e. The EPS connector with its 4 pairs of wires (8 wires in total) can carry over 300 watts to a CPU through that connector.

If you have additional 4pin or an extra 8 pin power connector, think of it as optional. It's there mostly for people who do extreme overclocking and you don't need to use that.

You can insert the CPU cable anywhere on the power supply, where it fits. It won't make a difference to the power supply.

 

I would group the cables as close as possible to the corners of a psu, to make it easier to hide them or route them through the back of the case to where they need to be.

[minibois]

12 minutes ago, Elbow said:

 

It's a 850W platinum, got it if I want to buy a second GPU in the future.

 

Guess I got all the answers I needed then! Was 90% sure that was the case but scared of the remaining 10% being ''oh my god you retard you put the wrong cable at the wrong place now this 3K computer is going to burn up fucking dingus''.

 

Rather be safe than sorry!

Is this a Corsair HX850 (or 850i)? That should come with two EPS 8 pin connectors, 1 connector per cable, 2 cables:

That way you can plug in both the EPS connectors on your motherboard (these 8 pin cables are also called 4+4 pin, because they have 'break apart' to get two 4 pin connectors, rather than one 8 pin).

As I said, unless you're overclocking a lot it's not necessary, but if you have the cables I don't see any reason not to plug them in.

 

Also, as other users said; these cables are thankfully keyed. Meaning you can't plug in the wrong cable into the wrong spot (like an 8 pin EPS in an 6+2 pin PCIE spot, or the PSU side of the cable into your videocard.. etc.)