I shouldn't think you'll get a two frame improvement because I don't believe that either card (Magewell or Blackmagic) contributes as much as two frames of latency at the capture stage, so there's not a 2+ frame capture latency there to be eliminated. At best (in theory) the low-latency mode can reduce latency in progressive signals by almost a frame (or by almost half a frame for interlaced signals). As for the Flex I/O cards, samples were first introduced at IBC last year, but I have no word as to when they will be available. Hopefully more news will be forthcoming at IBC in a little over a month. I believe that there's been a bit of a rethink on the internal design which has caused the delay.

On my tests basically same latency with magewell or blackmagic. In fact i think blackmagic has less latency with progressive signals than magewell, difficult to measure because is 1f or less difference.

Genlock do nothing for capture and is not needed. Asap signal is comming it is captured and processed, no need to sync with others. Genlock is for blackmagic output, to send signal at same "time" than other signals when it comes to a switcher or mixer, that way you will get one less frame on the mixer input.

In my test "low latency mode" and normal mode same latency... maybe i need more complex compositions...

regards,

Jose.

I didn’t test all magewell cards, only procapture quad sdi and dvi.
Depend of format interlace/progresive latency can be different between decklink/magewell. In all my tests decklink has same or less latency than magewell.
I use different decklink, quad2, duo, 4k... all has same latency.
The bigger difference from magewell/blackmagic is supported formats, blackmagic do not like some 3g sdi formats.