What will happen if someone powers a GPU through USB3.0 slots meant for sharing data? Will the GPU be detected just like when using a riser in the pcie x4 lanes or will this start a 🔥? Just curious lol
No you can't connect a GPU by just plugging in the USB riser into a USB slot. If anything you might cause some damage because there are some power supply pins there which might end up going to the wrong pin on the GPU and fry something.
The only reason why riser manufacteurs used an USB cable is because its widely available and has enough pins to power the data from a GPU. So instead of designing a brand new cable which takes data from riser into the motherboard, they decided to save money and time by just using a cable thats already out there.
Don't plug in your riser USB into a USB slot.