H12SSL CPU power connector question

[ivans89]

Hi, I have a H12SSL with 7313 CPU. I wanted to use one 8 pin connector for the GPU but the system is not starting with only one connector connected. After that I tried to split the 2nd one with y cable, but if I put it into the gpu system is not starting again. If I took it off, it works.
Is there a way to solve this?

 

[RolloZ170]

what PSU ?
GPU needs independent +12V or the PSU must have only one +12V Rail.
molex to 8 pin dones not work, molex are same source than 24pin = lower max. current.

 

[ivans89]

PSU is PWS-1K28P-SQ

Molex to 8 pin gpu works. That’s how it’s running rn, but I’m filling the Supermicro 846 with storage and will need the molex for it.

 

[RolloZ170]

Molex to 8 pin gpu works.

only with ONE single +12V Rail. danger if you don't know.

 

[ivans89]

only with ONE single +12V Rail. danger if you don't know.

What option I have instead of this?

 

[RolloZ170]

What option I have instead of this?

whats impossible can't be solved.
if your molex OCP is at low current you get issues, sometimes the OCP is disabled by shorting independent +12V rails, you risk a fire.

 

[RolloZ170]

conclusion is : you can not generaly say molex->8pin works. like a lottery if you don't know anything about the PSU.

 

[ivans89]

So best way is to switch to a gpu with 75w?

 

[RolloZ170]

So best way is to switch to a gpu with 75w?

or a PDB with GPU conns.

 

[ivans89]

But is there one that fits in the supermicro 846?

 

[RolloZ170]

can you check temp. with ATX PSU if it generaly works and proof it is a PSU issue ?

 

[RolloZ170]

But is there one that fits in the supermicro 846?

if this is not a GPU chassis you are maybe out of luck.

 

[ivans89]

Seems I’m out of luck

 

[DaveLTX]

Since it entirely depends on the power supply board, if it doesn't have GPU power plugs you're out of luck

 

[ivans89]

It doesn’t have. So I will see to switch to the NVIDIA L4 and sell the a5000.

 

[RolloZ170]

read this thread pls. ( PDB-PT747-4648 )

https://forums.servethehome.com/index.php?threads/pcie-6-pin-8-pin-from-supermicro-cse-846-power-distribution-board.34404/

 

[ivans89]

read this thread pls. ( PDB-PT747-4648 )

https://forums.servethehome.com/index.php?threads/pcie-6-pin-8-pin-from-supermicro-cse-846-power-distribution-board.34404/

Ah, so it seems PDN-PT747-4648 could fit?

 

[RolloZ170]

Ah, so it seems PDN-PT747-4648 could fit?

Supermicro support responded and confirmed, what we knew, that the PDB-PT846-8824 does not support PCIe 6-pin/8-pin.

They recommended me the PDB-PT747-4648 to gain the PCIe support. (as @NablaSquaredG suggested in the first reply to this thread) ;-)

 

[ivans89]

Here from reddit:

I just did it. Yes it fits and the PWS-1K21P-1R P/S I have slide in just as they did before. The metal plate that the PDB sits on needs to be dremeled away a bit at the bottom as the power sockets on the PT747 are wider than the PT846 and won't slide all the way onto the plate without that bit of adjustment.

Also, I had trouble getting the plastic cover on due to there being more wires coming off the PT747. I finally said F it and just left it off.

 

[ivans89]

I asked Supermicro support too, a few weeks ago. They told me it doesn't fit.