Workstations aren't normally our focus, but when Dell shows off a new Precision system that lets four media pros share its graphics hardware at once, you can be sure the company has our attention. If your IT chief springs for a Precision R5500 with four Quadro 2000 cards, each of those cards can take advantage of a graphics pass-through in Citrix's virtualization to render 3D models at speeds much more like what you'd get if the