Corsair RM750i compatible with MSI MPG X570?

[aougli]

I'm in the process of upgrading most of the internal components of my PC including the motherboard and PSU.

I bought an MSI MPG X570 Gaming Plus motherboard and a Corsair RM750i PSU (and other things).

This motherboard needs a 24 pin ATX_PWR1 and an 8 pin CPU_PWR1 cable, which are supplied.

Additionally, the motherboard needs a 4 pin (2 x 2) CPU_PWR2 cable which is not supplied.

I tried powering up with just the two supplied cables and the fans started spinning but it doesn't boot.

So Corsair only supply two of the three required CPU power cables.

I wanted to check that this PSU is suitable for this motherboard and which additional cable I need to buy. Maybe the Akasa 4 pin to 8 pin ATX PSU adapter (Stock code: CB-063-AK)? But plug it in where, the only unused sockets on the PSU are 6 pin or PCIe?

Would appreciate some suggestions as to the right cable or PSU for the motherboard. Thanks

 

[aougli]

Thanks replying.

The PSU wasn't sold as "open box".

The graphic you posted specifies only one 8 pin cable with the RM750i, which is supplied, and I'm using for the 8 pin CPU_PWR1.

Which leaves the 4 pin CPU_PWR2 without a power cable and unable to boot.

My mistaken assumption was that a relatively high end PSU would be able to satisfy a modern motherboard.

As to how to rescue the situation, I'm hoping not to have to replace the PSU.

Do you think the Akasa 4 pin to 8 pin ATX PSU adapter (Stock code: CB-063-AK) would work? Worth a few quid to find out?