Hirose 12 Pin Male To 12pin Female Cable For Sony Camera Ccxc-12p05n Ccd Video Analog Industrial Camera Medical Mould Monitor - Connectors - AliExpress
Here's the new 12-pin NVIDIA PCIe Power connector in more detail, much smaller then you
12ピン丸形Hirose HR10 GPIOコネクタ | Teledyne FLIR
Expect To See Nvidia's 12-Pin Power Plug On Future PCIe 5.0 GPUs | Tom's Hardware