I've been using the arch package without any problems for a while now, and didn't have any problems while upgrading previously. Anyways, I cleared the old files and re ran the upgrade, and it works fine now.

A small side note..fps values in glxgears seem to have taken a hit.. previously I was getting ~ 15500fps, now with the new drivers I get ~ 14000fps

See http://pastebin.archlinux.org/23421

If this fps drop is expected behavior (since glxgears is not a true index of performance), then a signoff for x86_64 from me.

Nvidia 7800 GTX for me btw.

Varun