Almost all Eluktronics laptops are built to order. However, we've found some configurations are frequently purchased and are now pre-building certain quantities with these components. Having a PC which which is Ready To Ship (RTS) requires less build time and in turn allows us to reflect an even better sale price to you. *Note, RTS items can not receive additional modification requests by Eluktronics as they've already been built and sealed. If you do not find the configuration which meets your needs and wish to customize, please seek the respective Customize To Order (CTO) option.