How to Install DDR 2 Memory Module Pairs

A Stick of DDR SDRAM

Starting with SDRAM, installing memory modules in pairs has allowed for boosts in system performance. With SDRAM (Synchronous Dynamic Random Access Memory) and the original DDR (Double Data Rate) SDRAM, installing memory in pairs permitted "interleaving," which allowed reads and writes to both modules at the same time. Starting with Dual Channel DDR, installing in pairs became a necessity to realize the performance boosts, rather than an option. This requirement has continued with DDR2 and DDR3 memory modules.

Instructions

1. Shut the computer down and unplug it. Remove the side panel and set it aside.

2. Lay the case on its side. Locate the two open memory slots. On the majority of motherboards, the related slots will be colored similarly, commonly one channel pair being blue, the other black. However, the colors may be different depending on the styling chosen by the manufacturer. These slots may alternate or they may both be next to each other.

3. Install the memory modules. Press the latches at the ends of the slot outward. Orient the module so that the pin rows and notch match the pin rows and notch on the slot. Put the module straight into the socket and push it firmly in at both ends until the white tabs latch on and the module pops into place. Do the same for the other module. Check to make sure the white tabs are firmly grasping the modules.

Tips & Warnings

• Be sure to use matched pairs of memory modules or, at the very least, make sure that both modules are rated for the same speed and timings. Using different speed and timed modules can result in system instability.

References

• William Bellisle-Pio; Network Systems Administrator; Auburn, Washington