old to new ATX12V 4pin connection for the CPU

[Crimsom_247]

I have just purchased a new Corsair HX750i ATX Power Supply CP-9020072-EU for my old ATX ASUS A8V Deluxe motherboard. The new Corsair ATX 750W PSU is more than adequate to power the old ATX ASUS A8V Deluxe motherboard whose recommended power requirement is 350W for a fully configured system. The CPU is an AMD Dual-Core Opteron 180.

My ASUS A8V motherboard wants a four pin ATX +12V plug with two yellow and two black wires to provide power to the CPU. The Corsair HXi has an ATX 24 (20+4) pin plug connector. The ATX 20 pin plug has been connected to the 20 pin ATXPWR socket on the ASUS motherboard. The remaining 4 pin plug of the 20+4 pin plug is not connected.

So I am looking for the ATX12V plug within the many other connectors provided with the Corsair HXi. Rather annoyingly the Corsair HXi connectors and their wiring are all black in colour, so I cannot look for a four, six or eight pin plug having yellow and black wires. Corsair did not include a leaflet giving guidance on which connector is used for a particular purpose. The Corsair technical help desk has not responded to my ticket.

I did find an eight pin connector whose plugs are marked with the identification of CPU and Type3, but the system does not boot up.

Does anyone know which of the all black Corsair connectors is used by the ASUS A8V motherboard 4 pin ATX12V? Thank you in anticipation. Kind regards.

 

[raisonjohn]

The HX750i should come with at least 2 cables for ATX12V. These cables, probably marked "CPU", are about 650mm in length. They have 8 pins in both ends: the solid 8-pin should connect to your power supply; while the other 8-pin ends actually splits into two (a 4pin + another 4pin). You should plug just 1 of those splits (a 4-pin) into your motherboards 4-pin ATX12V socket. The plugs are designed to only fit one way so find the correct orientation into the socket and push down firmly until the connectors fit.

Here are some selected cables that should come with your HX750i:

The longest cable (top of the photo) is for SATA power. The next cable (below it) is for the GPU/PCIe. The next cable (bottom cable in the photo) is the ATX12V with a 4+4pin at one end <--- this is the cable you will use for the 4-pin ATX12V motherboard socket.

 

[Crimsom_247]

Hello raisonjohn, thank you for your prompt response. The photograph does not display, but your description was sufficient from me to find the ATX12V cable. It is the eight pin connector whose plugs are marked with the identification of CPU and Type3 and there are two of these ATX12V cables. This ATX12V cable has been installed into the four pin motherboard socket, but as reported earlier the system does not boot.

The motherboard's green led illuminates, but the on/off power button led does not illuminate and none of the fans power on. I have checked all the connections and they are correctly seated. Most perplexing because everything was working fine before the old PSU expired.

I note the HX750i has a diagnostic socket so I am now wondering if this facility can be used to tell me more about the nature of this new problem.

Not-with-standing, many thanks for your assistance with this enquiry. Kind regards.