I know that many of you are excited about El Cap coming in 2 days. I need to remind you that all newer Nvidia cards require delicate planning whenever there is an OS update.
The good news is that our EFI cards make this easier then for the poor souls with unflashed cards. They end up staring at a black screen as their Mac endlessly reboots.
So, if you have one of the following cards you need to think before hitting that "update" button:
GTX Titan Black
All of those cards have been left out of OS X since 10.8.5. Will Apple ever include drivers for them? Hard to say, but until the iPad Pro comes with a 980, maybe not.
So, again, please come here or read at Macrumours Mac Pro section or Netkas.org to see what the news is on the 30th. We are on the West Coast so lunchtime for you may be breakfast for us, we may not have the first posts.
Currently the GM build has numbers that match the linked driver from our driver page. If Apple changes the build number for Final Release, expect Nvidia to have an update. Unfortunately, if Apple springs the change on Nvidia at the last moment, it may take a day or two to be issued. If there is a work around, we will post it here. It is also possible that Apple will keep the GM build version and all will be well. The current Nvidia driver has a "b" in the version number, that means "Beta". Expect a release with an "F" in the Final one.
Again, please think before you hit "update", if there isn't an Nvidia driver yet you will be really mad at yourself.
UPDATE: Not only was the Beta driver compatible with 15A284, but Nvidia has already issued a Final driver for 10.11 Build 15A284. Please see the driver download page.
For those running Yosemite on an EFI card from us that requires Web Drivers, you will need to do the nv_disable step to install El Capitan, then turn the drivers back on via terminal. See the instructions here:
Please note that the nv_disable terminal command does not have to be done from single user mode, it can be done whilst running a previous version of OS X before you run the installer.