The Virtual Machine does not see the physical graphics adapter as it emulates its own.
VMware Fusion (menu bar) > Help > Search > type Specifications then select Virtual Hardware Specifications
That said, it stands to reason that the better the underlying physical hardware layer is the better the performance on the Host and in turn there should be some benefit however if the primary reason for purchasing that particular card is for better performance in and Guest Mac OS X Server Virtual Machine then you'll probably be disappointed.
