Laptop Memory Guide

Laptop memory modules are similar to the ones used on desktops but come in a smaller form factor called SODIMM (or SO-DIMM) which stands for Small Outline Dual Inline Memory Module. Other than the small form there is also the limitation of only two slots compared to desktop systems which have three or four slots to upgrade memory.

The memory types such as PC2100, PC2700, DDR266, or DDR333 all apply to SODIMM's in the same fashion as regular memory modules.

Above left: DDR SODIMM ; Above Right: DDR DIMM

Current laptops use 200 PIN SODIMM's which are DDR modules, the 144 PIN SODIMM's are non-ddr and used in older machines.

Memory Upgrade and Buying Tips

When you buy a laptop it may come with a set amount of system memory or you may be able to configure how much you want, in many cases you can save money buy specifying the least amount of memory available (or just 256mb..128mb doesn't cut it these days) and then upgrade or add a new module bought seperately.

Memory added during configuration of a laptop on a manufacturer website usually costs quite a bit more than buying it seperately. For example, at the time of this writing, selecting a single 512mb stick of RAM over the base of 256mb at some well known companies adds approximately $200 to the price when you can get a 512mb stick for around $100-130 and add it to the original base of 256mb for a total of 768mb of memory.

Basically:
256mb 1x512mb at laptop configuration = 512mb total for $200 over base cost.
256mb + 1x512mb from 3rd party = 768mb total for approx $100 - $130 over base cost.

(approximates and may change over time, must also be 1x256mb stick in base configuration not 2x128mb due to slot limitation)

Always check to make sure upgrading the memory yourself will not void any warranty, get the right type, and check the manual or manufacturers website for proper upgrade instructions.

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