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Study Guide: CompTIA A+ Core Certification: RAM Comparison
Source: https://www.fatskills.com/comptia-a-exam/chapter/comptia-a-core-certification-ram-comparison

CompTIA A+ Core Certification: RAM Comparison

By Fatskills Exam Guides Team — the exam nerds behind 28,500+ quizzes and 2.1M practice questions across 500+ global exams.

⏱️ ~1 min read
RAM Type Pins (DIMM) Pins (SODIMM) Common Type and Speed Defining Characteristic
DDR SDRAM 184 200* PC3200 = 400MHz/3200Mbps Double the transfers per clock cycle, compared to regular SDRAM
DDR3 SDRAM 240† 204 DDR3-1333 (PC3-10600) = 1333MHz/10,600Mbps External data bus speed (I/O bus clock) that is 4x faster than DDR SDRAM
DDR4 SDRAM* 288‡ 260 DDR4-2400 (PC4-19200) = 2400MHz/19200Mbps External data bus speed (I/O bus clock) that is 2x faster than DDR3 SDRAM (8x faster than DDR SDRAM)
DDR5 SDRAM* 288 262 DDR5-7200 (PC5-57600) =7200MHz/57600Mbps External data bus speed (I/O bus clock) that is 2x faster than DDR4 SDRAM (16x faster than DDR SDRAM)


*DDR SODIMM keying is closer to the middle of the motherboard than with SDRAM SODIMMs.
†The keying on DDR3 is offset to one side, compared to DDR2.
‡The keying on DDR4 is different from the keying on DDR3, and they are not interchangeable.


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