For Acer Aspire ES1-512 Intel N2840 Motherboard 14222-1 448.03703.0011 test OK. Original Motherboard! 100%25 tested work before. Motherboard part number: 448.03703.0011 This is very important. do not know your motherboard part number. 1x Motherboard. All products are quality checked.. Condition:: Used: An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections. See all condition definitions : Brand: : Acer , Number of Memory Slots: : 12: MPN: : Does not apply , UPC: : Does not apply: Compatible CPU Brand: : Intel , EAN: : Does not apply: Memory Type: : DDR3 SDRAM , 。