
This new connector, dubbed 'Slot 2', was used for Pentium II Xeon and the first two Pentium III Xeon cores, codenamed 'Tanner' and 'Cascades'. Slot 2 was finally replaced with the Socket 370 with the Pentium III Tualatin; some of the Tualatin Pentium IIIs were packaged as 'Pentium III' and some as 'Xeon', though they were identical.
A memory slot, memory socket, or RAM slot is what allows RAM (computer memory) to be inserted into the computer. Most motherboards have two to four memory slots, which determine the type of RAM used with the computer. The most common types of RAM are SDRAM and DDR for desktop computers and SODIMM for laptop computers, each having various types and speeds. The picture below is an example of what memory slots may look like inside a desktop computer. In this picture, there are three open and available slots for three memory sticks.

When buying a new computer or motherboard, pay close attention to the types of RAM the memory slots can accept. Make sure you know exactly type of RAM to buy for your computer. It is also important to note how many available memory slots are available in your computer. It is not uncommon for computers to have all memory slots occupied. If all slots are full and you want to upgrade the computer memory, you need to remove some or all of the existing memory.
Memory module, Memory terms