You've probably landed on this page because you either want to get up to speed with what DDR laptop memory is or you're bang in the middle of trying to upgrade your laptop but stuck what to do. Well you know what? You've probably landed on a page that can help!
A good place to start is an introduction to DDR laptop memory...
Types of DDR laptop memory
DDR stands for Double Data Rate and is an enhanced (faster) form of SDRAM (Synchronous Dynamic Random Access Memory). Virtually all laptops sold today as well as those sold since circa 2002 use a given (older or newer) version of DDR laptop memory. Put it in plain English DDR memory is faster than standard SDRAM because it can transfer data on both the falling and rising edge of each clock cycle and hence the 'double' in its name. There's absolutely no reason you should remember this but just note that if you ever see DDR SDRAM mentioned anywhere, be sure to appreciate this is the exact same thing as plain vanilla DDR.
So moving on, what types of laptop memory do we have?
DDR laptop memory, otherwise known as DDR1 (though this isn't an official name instead referred to as just DDR) or DDR SDRAM is the oldest and slowest. It's predominantly available in capacities up to 1GB (per module) and at speeds of up to 400MHz (effective).
DDR2 is an evolution to DDR with some internal enhancements to boost performance and usually available in capacities up to 2GB (per module) and speeds up to 1066MHz (effective).
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