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Windows 7: 4GB Not Utilized w/ Ultimate x64 ?? why?

03 Aug 2011   #1

Windows XP Pro SP3, Windows 7 Pro 32-bit, Windows 7 Ultimate 64bit, Windows XP Home SP3
4GB Not Utilized w/ Ultimate x64 ?? why?

On HP DC7600, running x64, windows is showing 3.25gb utilized with 4GB installed.

My System SpecsSystem Spec
03 Aug 2011   #2
Microsoft MVP

Win 7 Ultimate x64

Full specs on that HP,

HP Compaq dc7600 Small Form Factor PC specifications - HP Small & Medium Business Products

with the relevant bit being that it has the Intel 945G chipset on it. With that bit of info it brings us to the why of it only using 3.25 GB of 4 GB of ram, the chipset itself only supports up to 4 GB of ram which causes this to happen,

The system memory that is reported in the System Information dialog box in Windows Vista is less than you expect if 4 GB of RAM is installed

For Windows Vista 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 Vista must be used.
which unfortunately with the exception of the 64 bit operating system, the 945G supports none of the above.
My System SpecsSystem Spec
03 Aug 2011   #3

Windows XP Pro SP3, Windows 7 Pro 32-bit, Windows 7 Ultimate 64bit, Windows XP Home SP3

I had thought maybe it was the nvidia card mapping...

soon I hope to forever move away from DT systems for my daily driver but still will use for labrats. I'm just looking for that budget laptop that has USB 3.0, sata III, sandy bridge, and significant graphics engine! they're still a little pricey at the moment but that will change with the tablet fever in high gear :)
My System SpecsSystem Spec


 4GB Not Utilized w/ Ultimate x64 ?? why?

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