Server PSU breakout board and autostart

[Amstellodamois]

I have the same as these: https://www.alibaba.com/product-detail/12V-12-Port-6-Pin-Server_60700450705.html

and I was wondering about the "power second PSU" plug: what's its pinout?

[mine2themax]

I wrote an article on the topic of server PSUs for GPU mining.  The 4 pin adapter (i am told) send a signal to the other PSU to power on - it's not used for power distribution.

If anyone has a pin out and what cable to use I would love to know.

[MagicSmoker]

Don't overthink the power supply sequencing - just leave the server PSU on all the time or else turn it on first and turn it off last (assuming a regular ATX PSU is used for the mobo and the server PSU only supplies the PCIe power connectors on each GPU).

[mine2themax]

I'm using a Y splitter IEC to when I flick the switch at the wall everything turns on.

[gt_addict]

I'm using a Y splitter IEC to when I flick the switch at the wall everything turns on.

I hope you arent overloading the socket or electrical circuit. Also I hope the Y Splitter has a decent gauge cable to take the load.

[MarkAz]

If it's like the DPS-2000BB, then I believe that actually is to help regulate voltage, so both power supplied output the same power - otherwise that slight variation can be a huge PIA.  I remember back when I was using both Jabberwock's and Optimizer's 4k boards, that was one (of several) reasons I picked Optimizer's boards - he actually implemented a bunch of additional server PSU functionality.

[Amstellodamois]

If it's like the DPS-2000BB, then I believe that actually is to help regulate voltage, so both power supplied output the same power - otherwise that slight variation can be a huge PIA.

If you put your PSUs in parallel, yes. But you don't have to.


As for my breakout board, no one know?

[Dbrouwers]

You need that cable only when you are powering for instance bitmain antminers because they will get extremely hot if part of the power stays on and the other stops.
If you use it on GPU you do not have this issue, just power this one on first and then start the MB.

I have the cheaper version of this breakout boards without display and they work just fine with my HP PSU's.

[Amstellodamois]

It's just that in case of a power cut, it won't automatically restart: I have to be there and push on the button.

So I'd like my ATX PSU to turn it on when power is back.

[MagicSmoker]

It's just that in case of a power cut, it won't automatically restart: I have to be there and push on the button.

So I'd like my ATX PSU to turn it on when power is back.

They do make breakout boards that are hardwired to turn on when AC is applied, and usually that version is cheaper. If you already have this board and it requires pressing a button to restart it then you'll need to get creative if you don't know how to solder.

[Amstellodamois]

I have the cheaper stuff as well, but I liked the 12 outputs (2 power connector per card plus a riser => 4 GPUs per board) of this one.

[MarkAz]

If it's like the DPS-2000BB, then I believe that actually is to help regulate voltage, so both power supplied output the same power - otherwise that slight variation can be a huge PIA.

If you put your PSUs in parallel, yes. But you don't have to.

Correct - but the only MB off the top of my head that allows you to do that correctly is that ASUS once with 3x ATX PSU plugs on it, otherwise you're mixing the PCI power from the MB with the power that you're providing from the 6/8 pin plugs.  Just worth pointing out - as many people forget this, and depending on the PSU's they might be calibrated close enough that it doesn't matter, or far enough out your rig will have a bunch of problems.

[Amstellodamois]

I'm powering each riser and its connected card via the same power supply. I thought it was enough since there's only a data line connecting the riser to the mother board.

[logandzwon]

That plug is just power plug. You plug the floppy power plugs from your ATX power and it will chain start this PSU. The issue I have is that sometimes that process takes too long and the GPUs do not start in time for the system to see them.

[Amstellodamois]

If you reboot the system, the PSU won't power down, correct?

[MagicSmoker]

If you reboot the system, the PSU won't power down, correct?

Nope, but that isn't an issue. You can leave the GPUs supplied by power all the time via their 6/8 pin connectors without issue, and no, they don't draw very much power in that state (maybe 1W each?).

[Amstellodamois]

I meant: "Since the server PSU didn't power up in time (for logandzwon) for windows to recognize them, he should simply reboot the rig"

[Amstellodamois]

That plug is just power plug. You plug the floppy power plugs from your ATX power and it will chain start this PSU.

Yes! Just a floppy plug from the ATX and the server PSU starts :-)