I'm currently running a ATI Radeon HD 5770, which does not support "Metal - a requirement to upgrade to Mojave. Apple suggests the following graphics cards prior to upgrading to Mojave:
- MSI Gaming Radeon RX 560 128-bit 4GB GDRR5
- SAPPHIRE Radeon PULSE RX 580 8GB GDDR5
- SAPPHIRE Radeon HD 7950 Mac Edition
I'm reluctant to just buy one more or less at random, as I've had trouble finding compatible graphics cards in the past. Suggestions?