[KaiserPro]

I read it that they've invented a product called time card, rather than the concept.

Its an accurate and stable clock source. which is an important distinction. The Meinberg PCI cards appear not to have a local clock source thats well disciplined (ie a temperature compensated oscillator)

Having an accurate time source that is updated once every second (typically) with a 1pps GPS is grand for most things. But if you need a stable clock as well, then you want a tiny atomic clock onboard as well. This is so you can run a clock source for an entire datacenter, or local section.