 The UX52VS has the option of Intel 's ultra @-@ low voltage i5 or i7 mobile processors , up to 10 GB of RAM and an optical disc drive . The latter is a first for the Zenbook product series . It drew criticism for its high price and lack of touch screen , but the screen quality , keyboard and system speed were praised . The battery life was considered acceptable taking into account the form @-@ factor and the discrete GPU , despite it being significantly shorter than the UX31A . 
