Its clearly a high end RAID controller, It's PCI express X8, six internal ports, one external. Full profile, and it has those unique heatsinks, identifying it as an adaptec.
^ Nah...either he's misinformed or this is an older discontinued model. Out of their current line, the 52445 is the only one with that design. The 51245 and 51645 share the PCB, but don't have as many ports.