DRAM vs. SRAM advantage: The major advantage of dynamic RAM (DRAM) over static RAM (SRAM) is ________.

Introduction / Context:
Choosing between DRAM and SRAM affects cost, capacity, power, and performance. DRAM cells use a single transistor and a capacitor, while SRAM uses multi-transistor latches. This architectural difference drives the primary advantages and trade-offs.

Given Data / Assumptions:

• DRAM requires periodic refresh; SRAM does not.
• SRAM is faster at random accesses and simpler to interface (no refresh).
• We compare mainstream parts at similar technology nodes.

Concept / Approach:
Because a DRAM bit cell is much smaller than an SRAM bit cell, far more DRAM bits fit on a die area, yielding higher storage density and lower cost per bit. However, DRAM access times are typically longer and require refresh logic, so raw speed is not the primary DRAM advantage; capacity and price are.

Step-by-Step Solution:

Verification / Alternative check:
Market data and datasheets consistently show DRAM providing gigabits per chip at low cost, while SRAM targets caches/buffers where speed matters more than capacity.

Why Other Options Are Wrong:

Common Pitfalls:
Equating “popular in PCs” with “faster”; DRAM dominates main memory due to capacity and cost, not because it is faster than SRAM.

Final Answer:
cost and storage density