Hi there,
Yes, the F5 does supercede the F5c BETA BIOS. I have downloaded it and am currently testing it on my system and there is already a difference in the way the memory is being handled.
I'm not sure what other things have been tweaked in the BIOS but, after updating and making some changes to the default BIOS settings, Windows 7 had a bit of a hissy fit and had to reload all of the main system drivers before it would settle down.
I will do some testing later on and post back if I discover any major problems.