Guide to Laptop Memories

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Kinds of Laptop Memories include the following:

Synchronous DRAM (SDRAM) laptop memory

• SDRAM laptop memory transfers data every full clock signal, waiting an up and down tick before responding to inputs.
• Their transfer rates range from 66 to 180 MHz, although most models have a maximum of 133 MHz.

Double Data Rate SDRAM (DDR-SDRAM) laptop memory

• DDR laptop memory transfers both at the up and down ticks of the clock, providing twice the speed of SDRAMs.
• They are physically incompatible with SDRAM systems, but can be used with more advanced RDRAMs using a matching parallel bus.

Rambus DRAM (RDRAM) laptop memory

• RDRAM laptop memory uses serial technology to enable multiple channels, including pairing with other RDRAM modules.
• High-end models can have up to twice the power of SDRAM systems, but usually have higher latency.

Size: Choose a laptop memory with the right capacity for your intended use. For general office work, 128 MB is a bare minimum, but 256 to 512 MB is usually enough. Heavier applications can run more smoothly on a 1 GB to 2 GB memory.

Latency: Choose a laptop memory with a latency rating of CAS 2 for SDRAM and CAS 2 to 2.5 for DDR-SDRAM. This will reduce data and power loss and allow you to run more programs simultaneously.

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