Despite the warnings in the past, there are always a few people who click on that "update" button before checking to see if the new Web Driver is out. For most folks I would guess that the Web Driver will be out in 24 hours or so and they should just wait.
If you have already run it, the GOOD news is that once again the EFI cards get a major break. You still get screen output in 10.10.5 post security update withOUT the Web Driver. The bad news is that there is no official route to have accelerated display, though I am certain Nvidia will have a fix out very soon. If you have already updated, here is a fix that will get you back up and running. Note, you will have to run in kext dev mode.
1. Run the 10.10.5 security update of 10/21/15
2. When you restart, if you have a card that requires Web Driver and has EFI, you will see laggy, unaccelerated video. (Black lines marching up the screen)
3. Go into System/Library/Extensions and drag the NVDAStartup.kext to your desktop twice. This will create 2 copies of it there. Let the system rename 2nd one. (Save both)
4. Right click to see contents of one without "2" in it's name. Open up the info.plist in X-Code or a plist editor.
5. In the field that has "14F27" change this value to "14F1021". Now save it
6. Use a kext utility to install the kext. (Kext Drop works, as will most others)
7. Run "Repair Permissions" on your OS install drive. You should see that kext get fixed.
7. Go into Terminal and type "sudo nvram boot-args="kext-dev-mode=1 nvda_drv=1""
8. Reboot and you should have working Nvidia acceleration. This was tested with GTX980, should work with other "web driver only" cards.
Keep in mind that you are running with kext signing requirement off. This isn't ideal but as I mentioned, this should only be necessary until new update comes out from Nvidia. I advise again that most people wait for the real driver, but for those who ran the update already, this is a way to keep working in 10.10.5 without reverting to older OS version.
If somehow you bugger this up or if when the new driver comes out it won't install, remove the "2" from the copy on your desktop and start at step 6 above and follow to end to get back to pore-modded state.
MacVidCards will begin offering EFI flashed GTX960 cards for Mac Pro 3,1/4,1/5,1.
These cards use less power then other cards, but OpenGl scores are lower then GTX680.
A primary advantage is that many have 3 @ DP ports, allowing use of a 5K display. They will also allow an EFI boot screen on 4K SST displays, something no "official" card has ever done.
More details coming.
Great news, it is super easy to use one of our EFI cards to install El Capitan on your 3,1/4,1/5,1.
Please note that this set of instructions applies SPECIFICALLY to the cards that require Web Driver and have EFI. Cards that don't REQUIRE the web driver can skip all of this, and you can add them later.
If you are currently running another version of OS X, you are golden.
1. Open the terminal and type:
sudo nvram boot-args="nv_disable=1"
2. Run the El Capitan Installer
3. When it is done (may reboot once or twice) download and install the Web Driver from Nvidia (links on our FAQ page about drivers)
4. Here is the important step, you must overwrite the nv_disable boot arg. Just installing the driver doesn't do this. You must open terminal and type:
sudo nvram boot-args="nvda_drv=1"
If you need other boot args like the 5K one, leave a space after the =1 and include them inside the quotes.
You will be prompted for your password, enter it and hit return. If you wish to verify that this worked, type:
And you will see contents of NVRAM, scroll up to see the boot args. It should just have what you entered inside the quotes. If you still see nv_disable=1 in there, you need to do this again until it is gone.
The easy way to know if you didn't do this correctly is if your screen is super laggy, and has a storm of black lines coming from bottom going to top. This is in software mode where the CPU is drawing the screen.
A good tip on the terminal is that if you use the up arrow key you can scroll through recent entries and use them again, or edit them and correct something if you missed a space. Or, if you recently enabled span mode and then do this install, if you scroll up and find the entry that you used before, you can save yourself some nit picketey typing.