Asus ROG STRIX B650E-F Gaming WIFI - No ATX 4 pin power connector (ATX_12V_2) from my PSU? Do I need to plug one in?

NeilF · 2 Mar 2024 at 14:50

So plugging in an MSI MPG A1000G 80 Plus Gold 1000W to my Asus B650E-F, I have a cable to plug into the 8 pin ATX_12V_1 connector from the PSU, but I can't see any connector for the PSU ending in 4 pins for the ATX_12V_2?

I assume I do NOT need to plug in any cable to that ATX_12V_2 socket (shown as A) from the PSU?

Strange there's no cable included with the MSI MPG A1000G that's suitable?

Tetras · 2 Mar 2024 at 15:00

NeilF said:
Strange there's no cable included with the MSI MPG A1000G that's suitable?

The 8 pin eps12v splits into 2 (4+4).

NeilF · 2 Mar 2024 at 15:11

The lead I seem to have is an single 8pin at the PSU (CPU/PCIe socket) to a single 8pin for the motherboard socket ATX_12V_1?

And then no leads from the PSU suitable for the 4 pin ATX_12V_2.

NeilF · 2 Mar 2024 at 15:50

Well, it's booted and working with only ATX_12V_1 plumbed in...

Tetras · 2 Mar 2024 at 15:57

NeilF said:
to a single 8pin for the motherboard socket ATX_12V_1?

At least one of the CPU/EPS12v 8 pins should split into 4+4 (the remaining 4 pins would just have to dangle by the side), MSI's website suggests that they both do and anandtech's review also lists them both as 4+4. I suppose it is possible they changed the manufacturing so that they no longer split, but I'd be surprised because that would make the PSU incompatible with older motherboards that only have 1x 4 pin.

NeilF said:
Well, it's booted and working with only ATX_12V_1 plumbed in...

Yeah, the manual says you can use 8 OR 8+4.

Liquid_Entity · 2 Mar 2024 at 16:02

I got a Corsair 1000w RMe or whatever model it is. I also didnt get a 4 pin connector, and no 8 split in to 2 either. I also just run off the 8 only.

NeilF · 2 Mar 2024 at 16:03

Liquid_Entity said:
I got a Corsair 1000w RMe or whatever model it is. I also didnt get a 4 pin connector, and no 8 split in to 2 either. I also just run off the 8 only.

Cheers for that. Nice to know it's all fine as is...

Liquid_Entity · 2 Mar 2024 at 16:04

I think the extra 4 pin is for overclocking shenanigans, something i've got a. no desire as b. got no clue

Tetras · 2 Mar 2024 at 16:09

Liquid_Entity said:
I got a Corsair 1000w RMe or whatever model it is. I also didnt get a 4 pin connector, and no 8 split in to 2 either. I also just run off the 8 only.

Are you sure? That would be very weird, Corsair's website even shows them as having a double width prong so that when it splits there's still a clip.

This would make these PSUs incompatible "out of the box" even with some fairly recent PCs

NeilF · 2 Mar 2024 at 16:12

Just checked again. There is no way to have a 4 pin connector...

Liquid_Entity · 2 Mar 2024 at 16:15

Probably right but I spent an age checking every cable and did not see one that would "split"

Tetras · 2 Mar 2024 at 16:31

NeilF said:
Just checked again. There is no way to have a 4 pin connector...

The anandtech review has the same double width prong as the Corsair, but anyway, it doesn't matter since you don't need it anyway, but will have to be careful buying a new PSU for my old motherboards, if this is a future trend.

SpellowHouse · 2 Mar 2024 at 16:39

NeilF said:
Well, it's booted and working with only ATX_12V_1 plumbed in...

You do not need to plug it in, unless your CPU requires the additional power. I can't say for your particular CPU, but for most people its fine unless they are going to overclock. You need to check the recommendations for your CPU (no doubt someone on here can calculate it!)MSI probably sell the cables if you need one.

sx_turbo · 2 Mar 2024 at 16:56

Akasa do an adaptor, I had same thing and used the adaptor to go from a spare 8 pin to 4 pin.

Not sure why it's has both if it works with just the 1 connector (maybe to do with power limits and over locking) but does seem odd that many PSU don't have this connector in them

Tetras · 2 Mar 2024 at 19:29

sx_turbo said:
does seem odd that many PSU don't have this connector in them

It is definitely surprising! Admittedly 8 pins have been more common for awhile now (e.g. don't think I've seen a solo 4-pin on a Ryzen board), but there's still many PCs that only have 4 pins (I'm typing on one of them right now).

sx_turbo · 2 Mar 2024 at 21:58

Tetras said:
It is definitely surprising! Admittedly 8 pins have been more common for awhile now (e.g. don't think I've seen a solo 4-pin on a Ryzen board), but there's still many PCs that only have 4 pins (I'm typing on one of them right now).

My b650 Asus board has an 8+4

mickyflinn · 2 Mar 2024 at 22:29

Surely the 8 pin EPs will fit into the 4 pin EPs connector leaving 4 pins hanging over , did you try putting it in ?

TonTom · 3 Mar 2024 at 07:19

I did a build with this board on Friday and just used the 8pin connector as you did with no issues.

Sin_Chase · 3 Mar 2024 at 13:18

I thought my Corsair HX1000i didnt have a 4 pin EPS connector and only 2 x 8 pins. I spent ages working out if I could run 8 pin only and after some Googlefu found that those cables did split.

I looked again and on first glance the seam and connection method is SO subtle it didnt look like it would split. I twisted the 2 halves of the connector and it did split into 4+4!

SpellowHouse · 3 Mar 2024 at 14:21

I have never used the second socket. Never used a CPU that uses that much power.