Windows 7: Dell XPS RAM not recognized

Initially, I had 2gb of RAM in 4 slots, 512 per. I recently upgraded to 4gb of RAM, yet, my machine only recognizes 2gb of RAM.

I have tried F2 and F12, but, there is no provision to set the parameters so it would recognize the entire 4gb of RAM.

Any suggestions as to what I can do? My machine is a Dell XPS 600 running Windows 7.

Each stick is 2gb. And I don't have them side by side; there is a slot between them. BTW, the RAM brand is PNY.

What version of windows 7 are you using, and what kind of ram (DDR, DDR2, DDR3) and the speed?

You have the wrong RAM. You need DDR2 4300 or 5200.

Also, if you are running any windows 32 bit, the dell manual says that it recognizes only 2GB of ram anyway.

Memory

You can increase your computer memory by installing memory modules on the system board.

Your computer supports DDR2 memory. For additional information on the type of memory supported by your computer, see the technical specifications for memory.

DDR2 Memory Overview

DDR2 memory modules should be installed in pairs of matched memory size and speed. If the DDR2 memory modules are not installed in matched pairs, the computer will continue to operate, but with a slight reduction in performance. See the label in the upper-right corner of the module to determine the module's capacity.

NOTE: The module's capacity label can also be seen in the upper-left corner of the module.

NOTE: Always install DDR2 memory modules in the order indicated on the system board.
The recommended memory configurations are:

A pair of matched memory modules installed in DIMM connectors 1 and 2

or

A pair of matched memory modules installed in DIMM connectors 1 and 2 and another matched pair installed in DIMM connectors 3 and 4

NOTICE: Do not install ECC memory modules.
If you install mixed pairs of PC2-4200 (DDR2 533-MHz) and PC2-5300 (DDR2 667-MHz) memory, the modules function at the speed of the slowest module installed.

Be sure to install a single memory module in DIMM connector 1, the connector closest to the processor, before you install modules in the other connectors.


1

matched pair of memory modules in DIMM connectors 3 and 4 (black securing clips)

2

matched pair of modules in DIMM connectors 1 and 2 (white securing clips)

NOTE: Memory purchased from Dell is covered under your computer warranty.
NOTICE: If you remove your original memory modules from the computer during a memory upgrade, keep them separate from any new modules that you may have, even if you purchased the new modules from Dell. If possible, do not pair an original memory module with a new memory module. Otherwise, your computer may not start properly. You should install your original memory modules in pairs either in DIMM connectors 1 and 2 or DIMM connectors 3 and 4.

Addressing Memory Configurations

If using a 32-bit operating system such as Microsoft® Windows® XP, your computer will support a maximum of 2 GB of memory. If you are using a 64-bit operating system, your computer will support a maximum of 8 GB (2-GB DIMMs in each of the four slots) of memory.

Type

533- and 667-MHz DDR2 unbuffered SDRAM

Memory connectors

four

Memory capacities

256 MB, 512 MB, 1 GB, or 2 GB non-ECC

Minimum memory

512 MB

Maximum memory

2 GB or 8 GB