The lexmark ms811dn network ready laser printer with internal 2 sided printing an 800 mhz dual core processor and large capacity of memory prints up to 63 ppm it can handle any job you can throw at it with help from its 512mb memory which is upgradable to 25gb and dual core 800mhz processor you can increase its paper handling capacity up to 4400 sheets which means it can suit most sizes of office environments