I'm not 100% certain that the card requires 5V signaling. If you want to know for sure, post a high resolution photograph of the card on a website somewhere and post a URL in this thread. The two things we need to see clearly are:
1. The number of physical notches in the card edge connector.
2. The part number on the chip with dozens of bus lines running to the card edge connector.
With that, we can make a pretty good diagnosis of how useful this card will be with current computers.
As Hard2Hear said, if the card requires 5V signaling, that card just plain won't work with modern motherboards. That said, the leaded gas analogy is backwards. The card is like a car that requires leaded gas or it knocks. Modern motherboards are like modern gas stations. You can't buy leaded gas any more easily than you can buy recent motherboards that still have 5V PCI slots.
Given that 5V slots were pretty clearly a dead end spec-wise by the time Aardvark released this card in '02, though, I can't imagine why they would even bother releasing a device that requires 5V signaling. If it really does require 5V PCI, that was pretty boneheaded, and I'd have serious questions about the competence of their design in pretty much every other area.