12v 8 pin EPS to 12v 8 Pin PCIe

pci-expresspower supply

I have a power supply that I have harvested from an old cryptocurrency mining rig that I'd like to use on a new rig however the PSU only has 8 pin EPS plugs.

There are six 8-pin EPS plugs plus a 20/24 pin motherboard connector.

  1. What would be the best option to convert these to 8pin PCIe for use with graphics cards (for a mining rig I'm looking to build)?
  2. Could fabricating a breakout board (eg through OSH park) be a good solution as I can not seem to find any converter cables from 8pin EPS to 8pin PCIe?

Thanks in advance for your help.

Best Answer

The EPS plug is an 8pin connector which has 12V cables and GND cables.

The PCIe plug is an 8pin connector which has 12V cables and GND cables. It also has two sense pins which as per the spec can be connected to GND if unused.

The connectors are wired as follows: Connector Comparison

So:

  1. Chop off the EPS connector shells and throw them in the bin.

  2. Then you buy new connector shells for the PCIe 6/8 connector (you could buy just the 6-pin connectors and get a 6-pin to 8-pin adapter cable, but no point if you are going to the trouble of recrimping).

  3. Crimp on new contacts to the cables from which you removed the EPS connector

  4. Plug in the new contacts in the corresponding locations on the PCIe connector shell.

  5. That is all. No electronics need. You literally just need to make sure the 12V cables go to the places marked +12V and the GND cables go to the places marked GND.

Alternatively, buy an adapter.

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