COMPTIA A+ Practice Exam 2025 - Free CompTIA A+ Practice Questions and Study Guide

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How many notches does a 168 pin DIMM have, like those used for PC-100 and PC-133 SDRAM?

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A 168 pin DIMM (Dual In-line Memory Module) used for PC-100 and PC-133 SDRAM has 2 notches. These notches serve as keying mechanisms to ensure that the DIMM can only be inserted one way into the motherboard. Option A, 1 notch, is incorrect because 1 notch would not provide enough stability for the DIMM to be firmly seated. Option C, 3 notches, and Option D, 4 notches, are also incorrect as DIMMs typically do not have more than two notches. Therefore, Option B, 2 notches, is the correct answer.

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