220-801 Question #473: Real Exam Question with Answer & Explanation

The correct answer is A: DDR. PC2400 is a bandwidth rating used for first-generation DDR (DDR1) SDRAM. The number represents peak bandwidth in MB/s: DDR running at an effective 300 MHz delivers 2,400 MB/s (300 MHz × 2 data transfers per cycle × 4 bytes = 2,400 MB/s). DDR1 used the plain 'PC' prefix (PC1600, P

Question

Which of the following RAM types is rated at PC2400?

Options

ADDR
BDDR2
CDDR3
DSDRAM

Explanation

PC2400 is a bandwidth rating used for first-generation DDR (DDR1) SDRAM. The number represents peak bandwidth in MB/s: DDR running at an effective 300 MHz delivers 2,400 MB/s (300 MHz × 2 data transfers per cycle × 4 bytes = 2,400 MB/s). DDR1 used the plain 'PC' prefix (PC1600, PC2100, PC2400, PC2700, PC3200). DDR2 used the 'PC2-' prefix (e.g., PC2-3200), DDR3 used 'PC3-' (e.g., PC3-12800), and original SDRAM used designations like PC66, PC100, and PC133.

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