BCM4501 Twin-tuner chip, used in older DM8000HD
BCM4506 Twin-tuner chip, used in newer DM8000HD
BCM4505 Single-tuner chip, used in tuner modules that comes with DM800HDse and DM7020HD.
It should work in all Enigma2 Dreamboxes.
Read more at the Broadcom webpage.
What I can tell you is that the twin Tuners that I have in my DB 8000 (BCM 4501) are fixed on the mother board not Plug & play but I don't know if the newer version of DB8000(using BCM 4506) are plug & play or the fixed type.