FirePro D300 Game Requirement Analysis
FirePro D300 is a workstation Graphics Card based on the 28nm GCN architecture.
It's based on the Pitcairn XT Core (same used on 7870) and therefore offers 1280 Shader Processing Units, 80 TMUs and 32 ROPs on a 256-bit interface of fast GDDR5. The central unit is clocked 775MHz while the memory clock operates at 1250MHZ.
It is thus considerably lower clocked and its gaming performance is even lower, as Radeon HD 7870 benefits from certified gaming drivers which unlock the GCN's architecture potential while FirePro D300 is made for professional applications. Therefore, expect its performance to be similar to Radeon HD 7850.