Currently the AMFI level requirement will be determined by the GPU needed.
- Intel iGPUs: Only Library Validation patch (`_cs_require_lv`)
- Nvidia Kepler and GCN: Full AMFI needs to be disabled (`amfi=0x80`)
If you have a mixed GPU system, the highest patch requirement will be chosen (ie. `amfi=0x80` on iMac15,1)