alleryWhich is the FASTEST memory in computer hierarchy?
AHard disk
BSSD
CCPU cache (L1 < L2 < L3, all faster than RAM)
DRAM
Answer & Solution
Correct answer: C. CPU cache (L1 < L2 < L3, all faster than RAM)
**Memory hierarchy (fast to slow):** CPU registers
→ L1 cache → L2 cache
→ L3 cache → RAM → SSD → HDD.
Cache levels are smallest but fastest.
L1 typically < 64 KB, latency ~1 ns. RAM latency ~100 ns.
HDD ~10 ms (10 million ns).
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