Types of RAM slots on the motherboard

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

RAM slot is used to connect RAM to the mainboard. There are different types of RAM slots:

  • 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 slot is a type of RAM slot used for old motherboards, which are no longer in use. There are 2 types of SIMM slots with 30 pins and 72 pins.

RAM with SIMM slot

2. RIMM slot

RIMM slot is a type of RAM slot used exclusively for RDRAM (high access speed, usually for servers). There are two types of RIMM slots with 184 pins and 232 pins.

RAM with RIMM slot

3. DIMM slot

DIMM slot is the most commonly used type of RAM slot on the Desktop. There are many types of RAM of this slot such as SDR-SDRAM, DDR-SDRAM, DDR2- SDRAM, DDR3-SDRAM, DDR4-SDRAM.

Types of RAM DIMM slots have different pin numbers and pin structures:

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

On the RAM DIMM slot, there is a voltage used for the RAM. Based on this voltage, different types of RAM DIMMs can be distinguished. For example, DDR RAM uses 2.5V, DDR2 uses 1.8V, DDR3 uses 1.5V, and DDR4 uses 1.2V.

Voltage of DIMM slot

4. SoDIMM slot

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

RAM with SoDIMM slot
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Posted by Vinh Le

Composer at ITLearningCorner.

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