ATI AMD Radeon HD 5770 1GB GDDR5 Graphics Card ATI-102-C01002(B) | eBay
RX 580 and 5770 in 2010 Mac Pro (5,1)? | MacRumors Forums
Amazon.com: Epic IT Service - AMD Radeon HD 5770 1GB GDDR5 Mac Edition, for Mac Pro 1,1 to 5,1 Models, macOS up to High Sierra (Attn: Legacy Model) : Electronics