FirePro D700 is a workstation Graphics Card based on the 28nm GCN architecture.
It's based on the Tahiti XT GL (same used on Radeon HD 7970) and therefore offers 2048 Shader Processing Units, 128 TMUs and 32 ROPs, but on a 384-bit interface of fast GDDR5. The central unit is clocked 850MHz while the memory clock operates at 1375MHZ.
It is thus considerably lower clocked and its gaming performance is even lower, as Radeon HD 7970 benefits from certified gaming drivers which unlock the GCN's architecture potential while FirePro D700 is made for professional applications. Therefore, expect its performance to be similar to Radeon HD 7950 Boost Edition.