Corsair HX850W PSU Doesn't Have Second 8 Pin CPU Cable?

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I'm upgrading my PC and have got myself an MSI Tomahawk Z790 DDR5 motherboard paired with an Intel 13900K CPU. I was hooking everything up and noticed that the motherboard requires 2x 8pin CPU cables instead of the 1 that my CPU has. The PSU is quite old (Corsair HX850W Model CMPSU-850HX) so I'm not sure if this is something you get with newer PSU's.

Do I need to connect a 2nd 8 pin power cable? If so, is it possible to get a CPU cable that will connect to one of the other 8 pin ports on the PSU, or will that cause issue?

...do I need to get a new PSU? :(
 
Try connecting it to the left one, that's cpu_pwr1 according to the manual. Older PSUs tended to only have the one.
 
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