Decklink card for MacPro4,1 using 2.5K images in Resolve

Wondering what the cheapest option for a decklink card into my macpro4,1 would be?

We'll be playing 2.5K via HDMI into a HD monitor.

Cheers,
Tim Mummery

The DeckLink Mini Monitor would be fine. Set your timeline to a custom 2.5K resolution (unless you need to deliver a different resolution) and set your monitoring to HD 1080. Resolve will then scale the output.