Study Lab

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Don't miss the Study Lab materials found on the CD accompanying this book. Each Study Lab is tailored to the individual chapters in this book, meaning that you'll quickly be able to determine which topics you understand well enough to pass the exam and which topics need more study. The Study Labs are presented in printable PDF format so that you can take them with you to study at work, on the road, or even in your car just before test time!

The Absolute Minimum

Here are the high points of this chapter. Review these just before you take the exam to brush up on the major topics and help you identify what you need to review.

  • Adding RAM to systems improves performance by minimizing disk accesses and by providing a larger workspace.

  • Adding cache RAM to systems improves performance for memory-bound operations. However, recent systems incorporate L2 cache in the processor.

  • To add RAM to a system, you must know both the CPU type and the type(s) of modules the system needs to determine the number of memory modules needed.

  • SDRAM and DDR SDRAM DIMMs are the most common modules used on recent systems and can be added one at a time to normal (single-channel) systems.

  • Dual-channel systems require two identical DIMMs.

  • Some advanced systems use RAMBUS modules.

  • SIMM speeds are rated in nanoseconds (ns).

  • SDRAM and Rambus speeds are rated in MHz (PC-133 or 133MHz SDRAM; PC800 or 800MHz Rambus).

  • DDR SDRAM speeds are rated in MHz or in throughput (DDR333 [333MHz] or PC2700).

  • CAS Latency (CL) values are used when specifying SDRAM and DDR SDRAM. Smaller CL values are faster.

  • Exchanging one module at a time is a good way to determine which module has failed in a system.

  • Cache memory should be disabled when main memory is tested .


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Absolute Beginners Guide to A+ Certification. Covers the Hardware and Operating Systems Exam
Absolute Beginners Guide to A+ Certification. Covers the Hardware and Operating Systems Exam
ISBN: N/A
EAN: N/A
Year: 2004
Pages: 310

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