Incompatible RAM cannot be installed in the incorrect slot because each type has unique electrical and physical properties. To ensure that users cannot inadvertently insert an incompatible module, DDR4 DIMM slots, for irummy topnstance, have a different notch placement than DDR3 slots. The stability & functionality of the system depend on this design element. There are variations of standard DIMM slots, such as SO-DIMM (Small Outline DIMM) slots, which are usually found in laptops and other small devices because of their smaller size. Though they are made to fit into smaller spaces without compromising performance, SO-DIMMs work similarly to standard DIMMs.