This is an old issue i have with my Intensity Pro 4k when editing with Resolve in windows 10 PC.
With HDMI connected to my monitor and audio monitor connected to audio out of my PC there is some slight out of sync.
Even if I use the audio from the Intensity card itself, via breakout cables, the audio is still not in sync.
My workaround has been to use the audio out of my monitor to my speakers as I find the audio from the HDMI is ok as far as sync.
Is there an ideal audio monitoring set up when using the intensity pro 4k?