Buying DDR computer memory chips requires several considerations, including clock speed, clock frequency, transfer rate, storage space, electronic interface capabilities, on-die termination, prefetch buffers, off-chip drivers, latency, band width, and operating voltage, some of which rise or fall in effectiveness to the implementation of the other factors involved.

DDR, DDR2, and DDR3, are each significantly different from one another, so it depends on the particular operating system to be used and personal preference. In the end, variation in price based on model and storage capacity makes buying DDR computer memory chips a task necessitating some technical knowledge and understanding.