M Series desktops with AMD processors or up to 2nd generation Intel® Core™ i series processors, and DDR3 memory deliver responsive performance at breakneck speeds—making quick work of the most intensive applications. If you need to power through advanced video editing and 2D and 3D image design, M Series can oblige.<br><br>And all M Series PCs are available with Lenovo Enhanced Experience for Windows® 7 for startup and shutdown times you have to see to believe — on average about 20 seconds faster boot! Some models like the M91/M91p feature Enhanced Experience 2.0 technology that's further optimized for business with dramatically improved application performance.