Hi there. If you interesting, one aliexpress seller sells adapter for usual ATX power supply but the price is very high
https://www.aliexpress.com/store/product/PSU-ATX-Power-Conver-Cable-24-Pin-to-18-Pin-8-Pin-to-8-8-6/215107_32778125250.html?spm=2114.12010612.0.0.5294Zq
If someone have power cable for CPU0,CPU1 and memory (hp p/n 647111-001), I ask him to help with pinout, I've tried to probe signals with multimeter but I'm not sure about three contacts
https://www.aliexpress.com/store/product/PSU-ATX-Power-Conver-Cable-24-Pin-to-18-Pin-8-Pin-to-8-8-6/215107_32778125250.html?spm=2114.12010612.0.0.5294Zq
If someone have power cable for CPU0,CPU1 and memory (hp p/n 647111-001), I ask him to help with pinout, I've tried to probe signals with multimeter but I'm not sure about three contacts