ATI HD5770 FleX 1GB GDDR5 Supports up to 4 Monitors
Sapphire HD 5770 FleX Specs | TechPowerUp GPU Database
Amazon.com: Epic IT Service AMD Radeon HD 5770 1GB GDDR5 Mac Edition, with 1GB GDDR5, Dual Mini DP and one DVI Output Ports, for Mac Pro 1,1 to 5,1 Models, macOS up
Review: Mid-range machinations: AMD's Sapphire Radeon HD 5770 and HD 5750 GPUs - Graphics - HEXUS.net
Sapphire Radeon HD 5770 Vapor-X 1GB Reviews | Overclock.net
Quick Review: Sapphire Radeon HD 5770 FleX 1GB
Sapphire 100283-3L Radeon HD 5770 1 GB Video Card (100283-3L) - PCPartPicker