•
Volatile
•
Semiconductor
•
Read / Write
•
Two Types : DRAM & SRAM
Dynamic RAM (DRAM)
•
Bits stored as charge in semiconductor capacitors
•
Charges leak
•
Need refreshing circuits (every few milliseconds)
•
Simpler construction
◦
Smaller per bit
◦
Less expensive
◦
Slower
•
Usually used in Main Memory
Static RAM (SRAM)
•
Bits stored in on/off switches
•
No charges leak
•
No refreshing needed
•
More complex construction
◦
Larger per bit
◦
More expensive
◦
Faster
•
Usually used in Cache
