PCIe lanes required for the DeckLink Mini Monitor

I would like to be able to use a 4K reference monitor with my PC but I am out of slots except for a PCIe x1 slot ( 1 lane, obviously). It is possible to purchase a low-profile PCIe x1 to x3 adapter and use the card, but the real question is, does the DeckLink Mini Monitor 4k card really require the bandwidth of 4 lanes to push 10bit 4K to the reference monitor?

I have used PCIe adapters before, and just because the card has the pins doesn't mean it requires that many lanes. So, until I can eventually upgrade my PC (which is sufficiently powerful enough at the moment with an nVidia 1080 card and a hoart-load of ram and SSDs and dual 4k monitors) I am curious what my options could be to push 4K to a reference monitor.

Is it PCI-E gen3 slot?
Only some UHD modes may work (up to 30p YUV), but depending on the card and adapter design it may not work at all. Not a good idea.
UHD requires bit more than half of the whole PCI-E gen3 x4 bandwidth for all possible modes.
If it's x1 gen2 slot then it won't work at all.