CompTIA A+ Training Kit: Understanding RAM and CPUs

  • 12/15/2012


  1. Correct Answer: B

    1. Incorrect: Different-colored slots indicate different banks.

    2. Correct: Dual-channel RAM should be installed in the same bank, which is the same color on most motherboards.

    3. Incorrect: If you place the RAM in different banks, it will be used as single-channel RAM instead of dual-channel RAM.

    4. Incorrect: Slots 1 and 4 are always in different banks.

  2. Correct Answer: C

    1. Incorrect: PC3-400 indicates a clock speed of 50 MHz.

    2. Incorrect: If the DDR3 name is used, it is identified as the clock times 8. 400 x 8 = 3,200, or DDR3-3200.

    3. Correct: The calculation for DDR3 is Clk x 4 x 2 x 64 / 8. 400 MHz x 4 x 2 x 64 / 8 = 25,600, so it is PC3-25600.

    4. Incorrect: PC3-12800 indicates a clock speed of 200 MHz.

  3. Correct Answer: A

    1. Correct: Hyper-threading is supported on Intel CPUs and allows each core to appear as two CPUs.

    2. Incorrect: HyperTransport is used on AMD processors in place of a front side bus.

    3. Incorrect: Dual channel RAM provides two paths to RAM, but it does not affect the CPU cores.

    4. Incorrect: L2 cache is fast RAM stored on the CPU for improved performance, but it does not affect the CPU cores.

  4. Correct Answer: A

    1. Correct: L1 cache is a fast cache, close to the CPU.

    2. Incorrect: L2 cache is slower than L1 cache.

    3. Incorrect: L3 cache is slower than L1 and L2 cache.

    4. Incorrect: Any type of DDR RAM is slower than L1, L2, or L3 cache.

  5. Correct Answer: D

    1. Incorrect: LGA 775 is Socket T and was replaced by Socket B.

    2. Incorrect: LGA 1366 is Socket B.

    3. Incorrect: LGA 1156 is Socket H.

    4. Correct: The LGA 1155 is also known as Socket H2 and replaces Socket H or H1.

  6. Correct Answers: A, B, C

    1. Correct: Faulty RAM can cause these symptoms.

    2. Correct: Failing or dirty fans can result in overheating problems, causing these symptoms.

    3. Correct: A power supply providing varying voltages or voltages out of specifications can cause these symptoms.

    4. Incorrect: Viruses can cause these types of symptoms, but a virus is software, not hardware.