The WPC15 Motherboard provides one 204-pin SODIMM slot. The socket supports up to 4GB DDR2 800/1066 SDRAM. When installing the Memory device, please follow the steps below： Step.1. Firmly insert the SO-DIMM at an angle into its slot. Align the SO-DIMM on the slot such that the notch on the SO-DIMM matches the break on the slot. Step.2.