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單項選擇題

A technician is performing a memory upgrade by installing an additional 1GB stick of DDR RAM
into a system. When the installation is complete, the computer shows 2GB of RAM at POST;
however, it now indicates a lower speed setting for the memory.
Which of the following is the MOST likely cause?（）

A. The newly installed RAM has a lower clock speed than the existing RAM.
B. The CPU is not configured to work with the additional RAM.
C. The system is incompatible with the new RAM.
D. The new RAM is of lower quality, and not dependable at higher speeds.

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