8 pin connection for 12 pin CPU power supply
8 pin connection for 12 pin CPU power supply
Your setup seems unusual but potentially functional depending on the adapter you're using. Since your motherboard has a 12-pin CPU power port, connecting multiple cables in a specific pattern might work if the adapter supports it. Just ensure the pins match and avoid damaging the board. You're safe to proceed as long as you double-check the pin configuration with your adapter.
You're dealing with an HP Z440 board. You'll need a compatible PSU adapter or the official HP Z440 PSU to prevent it from shutting down completely.
I couldn't locate a definitive pinout for that board, which means you'll need to rely on this advice: since ground must stay grounded, you should test the connections by matching them to a known reference (like a USB header). If most pins share the same function, it's likely +12. if not, good luck!