GB means 1 billion bytes and TB equals 1 trillion bytes; significant system memory may be used to support graphics, depending on system memory size and other factors. GB means 1 billion bytes and TB equals 1 trillion bytes; actual capacity or memory size will be less. A 64-bit operating system is required to support 4GB or more of system memory. Intel, the Intel Logo, Intel Inside, Intel Xeon, vPro, Ultrabook, Intel Core, and Core Inside are trademarks of Intel Corporation in the U.S. and/or other countries. Microsoft, MS, Windows and the Windows logo are either registered trademarks or trademarks of the Microsoft group of companies in the United States and other countries. Dell, the Dell logo and Vostro, are trademarks of Dell Inc. 2016 Dell Inc. All rights reserved.