Motherboard RAM Slots - CompTIA A+ 220-801: 1.2

Memory Slots

• Memory types have changed through the years
• Driven by standardization and technology
• One of the most important components of your computer
• Speed, speed, speed
• Every motherboard is different
• Check your documentation

SIMM ( Single In line Memory Module )

• Single In-line Memory Module
• No longer used
• 30 pin and 72 pin
• Not all SIMMs follow the standard
  

 RIMM ( Rambus Inline Memory Module )

• 16 bit (184 pins) and 32-bit (232 pins) modules
• Contains Rambus Dynamic Random Access Memory ( RDRAM )
• Every memory slot must be filled
• 16 bit modules require a Continuity RIMM (C-RIMM)
• 32 bit modules require a Continuity and Termination RIMM (CT-RIMM)

DIMM ( Dual inline memory module ) - Most Common Today 

• Dual inline memory module
• electrical contacts are different on each side
• 64 bit data width
• Package used for SDRAM (168 pins), DDR (184 pins), and DDR2/DDR3 (240 pins)

SO-DIMM ( Small Outline Dual In-line Memory Module )

• 68mm x 32mm
• 72 pin, 100-pin, 144-pin, 200-pin and 204- pin versions
• Used mostly in laptops and mobile devices