hello, After months of struggling it was another user's post from tonymac (user: Konx) that got my GTX 960 working. You simply have to enter a few boot flags and use common sense when booting (and admittingly I didnt always do that).
This method worked with my video card and a gigabyte GA-Z68AP-D3 and an Intel i5-2400 CPU. Also worth noting is that when booting with Clover on my El Cap flash drive, it chose the SMBIOS as an iMac12,1. However when I went from Mountain lion to Mavericks, I had to go from using macPro3,1 to iMac 13,1 in order to get it to boot. So your SMBIOS may need to be changed for this to work fully if you've never gotten El Cap to work before.
(If your hard drive already has El Capitan on it, skip to step 5.)
Boot up to your El Cap installer flash drive.
Go into Boot options in Clover and enter "npci=0x2000 nv_disable=1", then save it.
Format your hard drive, then install El Capitan and reboot.
Boot up to your El Cap installer flash drive.
Go into Boot options in Clover and enter "npci=0x2000 nv_disable=1", save it, then boot to your OS X drive.
Finish the installation (password, checkboxes, etc) until you're at the Desktop. Install Multibeast with the settings for your motherboard and drives. If your board uses UEFI, select that as the boot install method. Otherwise choose the BIOS install method. Do not restart.
Install the customac essentials, then install the 10.11 nvidia web driver. Found here on tonymacx86.com
Restart, and boot from your Mac OS X El Capitan drive, not the USB El Cap installer flash drive.
In Clover, you still have to enable the Nvidia web drivers, but to get there you have to use minimal graphics first like you have been. So go back into the options and select "npci=0x2000 nv_disable=1", then select your OS X drive and boot from that.
When you get to the desktop, go into System Preferences or hte Nvidia menulet at the upper right of the screen, then change it from OS X default drivers" to "Nvidia web drivers" and reboot again using the mac OS X drive, (not the USB El Capitan installer flash drive, which you can remove at this point).
Reboot again from your Mac OS X El Capitan drive without using any of the previous boot flags.
Hopefully at this point you should be able to boot to the desktop with no issues.
Thanks again to tonymacx86 user Konx for his initial post which worked for me
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