Normally you expect 5V with USB, but recently I found a site who's claiming to sell a PCIe USB 12v and 24v card.
These cards allow USB speeds up to 480 Mbps and include over-current protection.
They designed their own connectors, but I feel like they are not safe, you can easily remove one of the small squares and you'll be able to plug it into the wrong connector.
Is this card even useful?
Who would want to buy such cards?
Source: https://www.delock.de/produkte/S_89655/merkmale.html?setLanguage=en