Thank you for your help,
Yes you are right, all the test I did, even with proxies files, have the same problem of sync. It must be something else.
-I tried both on system SSD disk, and one one internal SATA hard disk which is installed on the computer, but no difference;
-it is a positive delay: I mean Resolve playback is always in late, after light Illusion (but it become significant after hours, for example Resolve has 1sec or 2 of delay after 10hours of calibration);
-the Black Magic Desktop Video is set 1080 24P,
-In Master Project Settings of Resolve, the Video Monitoring is set to HD 1080 24P also, and the Playback Framerate is set to 24fps.
Do you see something wrong?
PS: I'm using a Dreamcolor with a DeckLink, then a HD-Link to do HD-SDI to DVI conversion, and see on the HD-Link documentation that the 1080 24P was a compatible format.