Unless you get a 12V-2x6 to 8-pin adapter, these PSUs are incompatible with most modern-day GPUs from AMD, Intel, and even Nvidia (RTX 30 and prior), apart from a few specific variants.

Before designing my own pogo pin adapter, I made Fiddy. It performs its job well. The Adafruit Fiddy will clamp down on small boards, and it will program them. There are a few shortcomings to the ...