Why is dimm installed in pairs

Figure Install DIMMs in pairs, starting with the pair farthest away from the center of the banks and working inward. Do not skip banks. Figure shows the grouping of DIMM pairs:. Figure shows one pair of DIMMs installed in bank 0 all modules must have memory in bank 0; if you have a two-module system, both must have memory in bank 0.

Figure shows how to insert a DIMM into its socket. Installing a DIMM. Press straight down across the entire top to make sure the DIMM is firmly seated. Avoid placing sideways pressure on the DIMM. After you have installed memory, you can verify that it is recognized by the system. Follow these steps:. If you originally had 64 MB of memory and you installed an additional 64 MB, hinv should report that the system has MB of memory. If hinv does not report the correct amount of memory, it may be because one or more of the DIMMs you installed is not seated correctly.

Shut down the system and reseat the DIMMs. Remove DIMMs in pairs, starting with the pair closest to the center of the banks bank 3. See Figure It recognized the only 4gb and actually ran slower. Windows home premium 64 bit OS. This thread is locked. You can follow the question or vote as helpful, but you cannot reply to this thread.

I have the same question Report abuse. Details required :. Cancel Submit. Visually inspect the DIMMs for physical damage, dust, or any other contamination on the connector or circuits. Visually inspect the DIMM slot for physical damage. Look for cracked or broken plastic on the slot. Dust off the DIMMs, clean the contacts, and reseat them. If there is no obvious damage, replace any failed DIMMs. Ensure that they are inserted correctly with ejector latches secured.

Power on the server and run the diagnostics test again. All rights reserved. The stored power lasts for about half an hour. Note - Disconnecting the AC power removes the fault indication. However, the Motherboard Fault LED lights to indicate that there is a problem on the motherboard only while AC power is still connected.