Lenovo D30 tower workstation is designed to be reliable and to make your work environment pleasant, with a unique tri-channel cooling system that keeps things cool on the inside and quiet on the outside. And the D30 allows you to multitask more than ever, supporting up to 16 DIMMS and 1600-MHz memory performance. It also proves that high performance can come in a green package, offering up to 90-percent power efficiency and Energy star 5.0 certification. D30. Extreme speed. Powerful graphics. Cool and quiet. Designed to tackle the biggest challenges, the D30 delivers the ultimate in performance and expandability, and comes with Windows® 7 Professional as the standard OS. You can process more tasks faster with the latest generation of up to eight core Intel® Xeon® processors and supporting discrete Quadro and Tesla graphics technology from Nvidia. From 3D product design and animation, to simulation and visualization, to heavy-duty number-crunching and software development, the D30 is designed for those who need to be more productive.