Updating NVIDIA drivers from 295.40 to 304.64: What will happen to TwinView?

[Spice002]

Right now, I have the NVIDIA proprietary drivers enabled without the Ubuntu-X repo, so the driver version is 295.40 (which is on the official Ubuntu repo) instead of the current 304.64 for my card, but I want to update to the current (using the Ubuntu-X repo). From what I heard, after 302.xx, NVIDIA started supporting RandR and removed TwinView. My question is, I have TwinView enabled for two monitors. If I update to the new version, what will happen to my TwinView settings? Will there be any extra work to do to migrate to the new driver?

If it's any help, here's my Xorg.conf:
http://pastebin.com/F19aaRSk

[Spice002]

Shameless self-bump.

[Spice002]

Bump again. It's really not a difficult question.