Types of RAM slots on the motherboard

This post is lesson 19 of 42 in the subject Computer Hardware

The RAM slot is where the RAM connects to the mainboard. There are various types of RAM slots, such as:

  • SIMM (Single Inline Memory Module)
  • RIMM (Rambus Inline Memory Module)
  • DIMM (Dual Inline Memory Module)
  • SODIMM (Small Outline Dual Inline Memory Module)

1. SIMM slot

SIMM slots are outdated and are no longer used in modern motherboards. There are two types of SIMM slots: 30-pin and 72-pin.

SIMM (Single Inline Memory Module)
SIMM (Single Inline Memory Module)

2. RIMM slot

The RIMM slot is a RAM slot used for RDRAM because of its high access speed. It’s usually used in servers and two types of RIMM slots are available: one with 184 pins and another with 232 pins.

RIMM (Rambus Inline Memory Module)
RIMM (Rambus Inline Memory Module)

3. DIMM slot

The DIMM slot is the most common type of RAM slot on desktops and can support many kinds of RAM including SDR-SDRAM, DDR-SDRAM, DDR2-SDRAM, DDR3-SDRAM, and DDR4-SDRAM.

Different types of RAM DIMM slots have varying numbers and structures of pins, as follows:

  • SDR has 168 pins
  • DDR has 184 pins
  • DDR2 and DDR3 have 240 pins
  • DDR4 has 288 pins

There are various types of RAM DIMMs with different voltages, such as DDR RAM using 2.5V, DDR2 using 1.8V, DDR3 using 1.5V, and DDR4 using 1.2V.

Voltage of DIMM slot
The voltage of the DIMM slot

4. SoDIMM slot

SoDIMM is a type of RAM slot for laptops. There are many types of SODIMM slots with different numbers of pins such as 200 pins (DDR and DDR2 RAM), 204 pins (DDR3 RAM), and 260 pins (DDR4 RAM).

RAM with SoDIMM slot
RAM with SoDIMM slot
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