220-801 Question #464: Real Exam Question with Answer & Explanation

The correct answer is A: 600 MHz. When RAM modules of different speeds are installed together, the system runs all modules at the speed of the slowest module to maintain stability. This is called 'downclocking.' Installing DDR2-800 alongside DDR2-600 forces both sticks to operate at 600 MHz. The memory bus cannot

Question

Which of the following speeds BEST represents the speed of the memory when installing DDR2 at 800 MHz and DDR2 at 600 MHz?

Options

A600 MHz
B700 MHz
C800 MHz
D1400 MHz

Explanation

When RAM modules of different speeds are installed together, the system runs all modules at the speed of the slowest module to maintain stability. This is called 'downclocking.' Installing DDR2-800 alongside DDR2-600 forces both sticks to operate at 600 MHz. The memory bus cannot run at an average (700 MHz, B), the faster speed (800 MHz, C), or the combined speed (1400 MHz, D). This is a critical concept for CompTIA A+ candidates: always match RAM speeds to avoid performance loss.

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