Okay, this is a not an elegant solution, but it worked and I know have accelerated graphics on my Dell Optiplex 960, 10.11.4, with a PNY GT710 - http://www.bestbuy.com/site/pny-nvi...rd-black/5092306.p?id=bb5092306&skuId=5092306.
How I installed a PNY Geforce GT710 in El Capitan
- Take the card out of the machine
- Boot with monitor on built in video port (no acceleration but works)
- Downloaded the NVIDIA new web drivers (without the card installed)
- Install...
How I installed a PNY Geforce GT710 in El Capitan