UntraStudio SDI Workstation

I purchased an UltraStudio SDI back in October and found that it is incompitable with the workstation I currently have. I read everything on this website and saw that the HP Z400 is compatible. Before I order one I wanted to confirm that this workstation will be able to handle HD capture: http://compeve.com/workstations/hp/hp-z400-workstation-2-53ghz-w3505-xeon-3gb-ram-80gb-fx-1500-win

Also, which exact USB 3.0 expansion card should I get for it (a link would be nice)?

Thanks,
Jason