What distinguishes laptop memory from desktop memory is the form factor Form factor is a memory’s physical size and its pin arrangement. Most desktop manufacturers use DIMM. A full-size DIMM has 100, 168, 184, or 240 pins and is usually 4.5 to five inches in length. Most laptop manufacturers use SO DIMM (Small Outline DIMM). A SO DIMM has 72, 100, 144, or 200 pins and is smaller — 2.5 to 3 inches. There is also SO RIMM, which is similar to SO DIMM, but like DIMM/RIMM has a different pin count.
DDR is the abbreviation for Double Data Rate. DDR3, and DDR4 memory are based on the design predecessor RAM SDRAM which stands for Synchronous RAM. This means that they synchronize things using a clock signal. Memories from the DDR category transfer two chunks of data in one cycle.
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