Since the release of Mojave, macOS requires Metal Supported Graphics Card, Without metal compatibility graphics acceleration is not possible in a Hackintosh with Mojave.
We have already covered an article with Metal Compatible AMD Graphics Cards, My advice here is to purchase AMD Metal Graphics Card instead of NVidia because the war between Apple and Nvidia is not over, there is no or little hope for NVIDIA Web Drivers.
1 ZOTAC GeForce GT 710 1GB DDR3 | 39$
- NVIDIA GeForce GT 710 GPU. 192 CUDA cores
2 ZOTAC GeForce GT 710 2GB DDR3 | 49$
- NVIDIA GeForce GT 710, 2GB DDR3 192 CUDA cores, 64-bit Memory bus, 954 MHz Engine Clock, 1600 MHz Memory Clock