SRAM vs DRAM (Difference Between Static RAM and Dynamic RAM)
RAM (Random Access Memory) is a type of volatile memory, which means it loses data when power is turned off. The two main types of RAM used in computers are SRAM and DRAM.
1. SRAM (Static Random Access Memory)
What is SRAM?
SRAM stores data using flip-flops and does not need refreshing as long as power is supplied.
Key Features of SRAM
- Very fast
- More expensive
- Requires less frequent power operations
- Used where speed is critical
Common Uses
- CPU cache memory (L1, L2, L3 cache)
- Registers
- High-speed memory applications
2. DRAM (Dynamic Random Access Memory)
What is DRAM?
DRAM stores data using capacitors and must be refreshed continuously to retain data.
Key Features of DRAM
- Slower than SRAM
- Cheaper
- Higher storage density
- Requires periodic refreshing
Common Uses
- Main memory (system RAM)
- Laptops and desktop computers
- Smartphones and tablets
Difference Between SRAM and DRAM (Tabular Form)
| Feature | SRAM | DRAM |
|---|---|---|
| Full Form | Static Random Access Memory | Dynamic Random Access Memory |
| Speed | Very fast | Slower than SRAM |
| Refreshing | Not required | Required periodically |
| Cost | Expensive | Cheaper |
| Power Consumption | Low (no refresh) | Higher (due to refresh) |
| Storage Capacity | Low | High |
| Circuit Complexity | Complex | Simple |
| Use | Cache memory | Main memory |
| Volatility | Volatile | Volatile |
Key Points for Exams
- SRAM is faster but costly
- DRAM is slower but economical
- SRAM is used for cache
- DRAM is used as main memory
- Both lose data when power is off
One-Line Difference (Exam Ready)
SRAM is faster and does not require refreshing, whereas DRAM is slower and requires periodic refreshing.