3 Memory and RAM Free Online FlashCards

What is RAM’s main role?

RAM is the computer’s fast, temporary working area where the processor reads instructions and data while programs run.

How does RAM differ from an SSD or hard drive?

RAM is volatile, so its contents disappear when power is removed. An SSD or hard drive keeps files persistently.

How are DRAM and SRAM commonly used in computers?

Most system memory is DRAM. Processors also use small amounts of very fast SRAM for cache.

Can DDR4 and DDR5 RAM modules be interchanged?

DDR generations such as DDR4 and DDR5 have different electrical specifications and notches, so they are not interchangeable.

How do DIMMs and SO-DIMMs typically differ in use?

DIMMs are full-size modules used in most desktops; smaller SO-DIMMs are common in laptops and compact computers.

What distinguishes an RDIMM from a UDIMM?

An RDIMM uses a register to reduce electrical load on the memory controller. It is common in servers and generally cannot be mixed with UDIMMs.

What does ECC memory do, and what support does it require?

ECC adds error-correction information to detect and correct certain memory errors. The module, processor, and motherboard must support ECC.

Why might RAM run below its advertised data rate?

A module may run below its advertised data rate if the processor, motherboard, installed configuration, or firmware imposes a limit.

Why is a lower CAS latency not enough to judge RAM performance?

CAS latency is one memory timing. Compare it alongside the data rate and other timings; a lower CL alone does not prove better overall performance.

How can a matched RAM pair enable dual-channel operation?

A matched pair in the recommended slots can enable dual-channel operation and increase available memory bandwidth.

What should you verify before buying RAM?

Check the exact system and processor specifications for generation, form factor, capacity, module type, ECC support, and supported data rates.

Can a DDR5 SO-DIMM replace a required DDR4 SO-DIMM?

No. A laptop requiring DDR4 SO-DIMMs cannot use DDR5 SO-DIMMs because the generation and electrical design differ.