Darin,
I reconfirmed again about this.
1. If your footage is R3D files you need to enable the cache+ mode or you need to render out and do the batch output to get the burn-ins go to tape.
2. If your footage is DPX files and you see no red icon in the thumbnail on your timeline it means you can do power mastering with your burn-ins without rendering. Just remember when you enable the power mastering, resolve will ask whether you want to enable the cache+ mode or not, just choose NO.
3. You will not see the burn-ins on your broadcast monitor while you grading, but it will go to the tape when you do power mastering without the need to render. I’m 110% sure about this, confirmed & tested on 4GPU Linux 🙂
Maybe someone from DaVinci support can double confirm about this?