the 140$ Valve Index cable has 42 pins in a DisplayPort like but smaller connector
I don't understand why
regular DP is 20 pins, but there are a lot of extra ground pins that I don't think are required for signal quality
you could repurpose the ground, config and power pins to have everything it needs through a regular DP cable
wtf
@ckie I could see that in standard configuration, but this is between the HMD and a breakout cable that becomes 12v barrel jack, DP and USB