Maintaining compatibility when replacing or upgrading memory modules requires an understanding of these differences. Also, users need to be aware of the particular blood sucker slotsspecifications of their motherboards, as some may only support specific DIMM types or have installable memory limits. A little attention to detail will enable you to complete the simple task of identifying DIMM slots on a motherboard. DIMM slots are long, rectangular connectors that are usually found close to the CPU socket.