Radeon HD 4650 (1gb) - No dual screen

[errandwolfe]

Have had a long running discussion on another site but figured I would ask around here. I have tried MANY different combination of kexts and bootloaders but neither myself (or anyone else I have talked to) has ever been able to get the 1 Gb version to support dual screens. The oddest thing is we have seen many reports of people who have the 512 Mb version of this card getting dual screens working with no problems.

Does anyone have any constructive ideas on why this may be happening?