ACER Aspire BL51  5100 3100 512MB Memory Ram DDR2  SEE PICTURE FOR EXACT RAM YOU WILL RECEIVE  TESTED --- 100% FUNCTIONAL  --    Comes with 14 days warranty  =--- please look at the picture carefully and make sure this is the part you need.   We do our best to describe items as accurately as possible, but mistakes happen. If you receive this item and feel it's not as described, please contact use first to resolve. We are customer friendly and your satisfaction is our priority.