4gb RAM installed, sometimes showed 2gb usable

For Windows to use all 4 GB of memory on a computer that has 4 GB of memory installed, the computer must meet the following requirements:

• The chipset must support at least 8 GB of address space. Chipsets that have this capability include the following:
  
  • Intel 975X
  • Intel P965
  • Intel 955X on Socket 775
  • Chipsets that support AMD processors that use socket F, socket 940, socket 939, or socket AM2. These chipsets include any AMD socket and CPU combination in which the memory controller resides in the CPU.
• The CPU must support the x64 instruction set. The AMD64 CPU and the Intel EM64T CPU support this instruction set.
• The BIOS must support the memory remapping feature. The memory remapping feature allows for the segment of system memory that was previously overwritten by the Peripheral Component Interconnect (PCI) configuration space to be remapped above the 4 GB address line. This feature must be enabled in the BIOS configuration utility on the computer. View your computer product documentation for instructions that explain how to enable this feature. Many consumer-oriented computers may not support the memory remapping feature. No standard terminology is used in documentation or in BIOS configuration utilities for this feature. Therefore, you may have to read the descriptions of the various BIOS configuration settings that are available to determine whether any of the settings enable the memory remapping feature.
• An x64 (64-bit) version of Windows must be used.

Thanks zigzag3143.

This is what my msconfig looks like. Nothing is checked.

Well I thought that was it but Antman and Tews are right

Again welcome

Ken

I can't find my way around Acer.com The best I can determine is chipset Mobile Intel 945GM Express, but this is based on sales data.

Tews said:

Card name: NVIDIA GeForce Go 7300
Manufacturer: NVIDIA
Chip type: GeForce Go 7300
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_01D7&SUBSYS_00901025&REV_A1
Display Memory: 1400 MB
Dedicated Memory: 121 MB
Shared Memory: 1279 MB

I could be wrong but there is 1.2gb of system ram...

If we got by this then it is using more that 1GB of RAM so shouldn't we then have less than 3GB available to the OS?

The irony here is: Scotteq addressed the limitation of your machine while he was harping on and on.

1. A memory controller which supports memory swap functionality is used. The latest chipsets like Intel 975X, 955X, Nvidia NF4 SLI Intel Edition, Nvidia NF4 SLI X16, AMD K8 and newer architectures can support the memory swap function.

Tews said:

that figure will fluctuate ....

The figure doesn't change. It remains the same all the time here.