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HP Compaq dc7800 Small Form Factor PC - Removing and Replacing the Memory

This document pertains only to HP Compaq dc7800 Small Form Factor PCs with the following case design:

Before you begin

  • Turn off the computer, and then disconnect all cables. Disconnect the Ethernet or modem cable before disconnecting the power cord.
  • Move the computer to a clear, flat, stable work surface over a non-carpeted floor.
  • HP strongly recommends the use of an anti-static wrist strap and a conductive foam pad when working on the computer.
  • Do not remove a component from its protective packaging until you are ready to install it.
  warning:
The edges of metal panels can cut skin. Be careful not to slide skin along any interior metal edge of the computer.
  caution:
This product contains components that can be damaged by electrostatic discharge (ESD). To reduce the chance of ESD damage, work over a noncarpeted floor, use a static dissipative work surface (such as a conductive foam pad), and wear an ESD wrist strap connected to a grounded surface.

Video overview (in English)

To view a video demonstrating the procedure for removing the memory, right-click Memory removal video and select Open link in new window/tab.

Replacement part information

The following HP part numbers are known to be compatible with this system:
note:
Part numbers are subject to change.
Description
Part Number
Requires Return
512 MB, 667 MHz, CL=5, PC2-5300 DDR2-SDRAM DIMM memory
396520-001 (Modified)
Yes
1.0 GB, 667 MHz, CL=5, PC2-5300 DDR2-SDRAM DIMM memory
398038-001 (Modified)
Yes
2.0 GB, 667 MHz, CL=5, PC2-5300 DDR2-SDRAM DIMM memory
450367-001 (Modified)
Yes
512 MB, 800 MHz, CL=6, PC2-6400 DDR2-SDRAM DIMM memory
418952-001 (Modified)
Yes
1.0 GB, 800 MHz, CL=6, PC2-6400 DDR2-SDRAM DIMM memory
418951-001 (Modified)
Yes
* If a part is listed as "Yes" under "Requires Return" then the defective part needs to be returned to HP. For more information about returning parts to HP select one of the links below:
note:
For customers in countries/regions with RoHS legislation* (e.g. EU, China, etc.) restricting the use of hazardous substances in electrical equipment. The use of the Original Spare part is regulated by RoHS legislation. If your unit contains a part that is labelled with the Modified Spare number, the Modified Spare must be ordered as the replacement part. If your unit contains a part that is labelled with the Original Spare number, please order the Original Spare as the replacement part. In this case either the Original Spare or the Modified Spare may be shipped which will not affect performance or functionality of the unit.

Memory removal

  caution:
Review the following safety considerations before performing the following steps. Failure to comply with these safety considerations could result in damage to the product.
Step 1
With all cables disconnected from the computer, remove the access panel.
Step 2
Push down and out on the memory socket latches to release the memory module.
Step 3
Pull the memory module up and out of the socket.

Memory replacement

note:
This computer uses non-ECC DDR2 PC2-5300 (667-MHz) and PC2-6400 (800-MHz) DIMMs. There are four DIMM sockets on the system board, with two sockets per channel. The sockets are labeled DIMM1, DIMM2, DIMM3, and DIMM4. Sockets DIMM1 and DIMM2 operate in memory channel A. Sockets DIMM3 and DIMM4 operate in memory channel B.
HP recommends dual-channel symmetric configurations for maximum performance. For best performance, add the same amount of total memory to each channel and do not mix speeds. For dual-channel symmetric performance, the total amount of memory in each channel must be equal. If speeds are mixed, speed will default to the slowest DIMM.
Step 1
Ensure that the memory socket latches are pushed out and away from the memory socket.
Step 2
Match the notch on the memory module with the key in the memory socket.
Step 3
Push the module down firmly into the socket until the latches snap into place and the module is fully seated.
Step 4
Replace the access panel.

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