Kewl Munky

I'm using Vista Home Premium 64 bit. I had a G-Skill 2GB dual channel RAM kit installed and just added an OCZ SLI 4GB dual channel RAM kit. My computer runs and everything, but when I look at the Vista specification chart it only reads 5.50GB of my 6GB.

Any help is welcomed.

PC eye

And if you had 8gb installed you would likely see only 7gb. What most simply don't realize when adding larger amounts of ram is that the chipsets on most boards even those seeing 8 and 16gb capacities are still designed around those with 2-4gb maximum. That limitation is why you are not seeing the full total amount.

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tyttebøvs

Most boards today that supports more than 4GB also supports memory remapping. So flip that feature on in your bios

Kewl Munky

Where would I access this memory remapping, and what exactly will it do so I can be prepared for any other changes?

PC eye

WORKAROUND

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.Contact the computer vendor to determine whether your computer meets these requirements.

Note When the physical RAM that is installed on a computer equals the address space that is supported by the chipset, the total system memory that is available to the operating system is always less than the physical RAM that is installed. For example, consider a computer that has an Intel 975X chipset that supports 8 GB of address space. If you install 8 GB of RAM, the system memory that is available to the operating system will be reduced by the PCI configuration requirements. In this scenario, PCI configuration requirements reduce the memory that is available to the operating system by an amount that is between approximately 200 MB and approximately 1 GB. The reduction depends on the configuration. http://support.microsoft.com/kb/929605

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Kewl Munky

Sorry that you had to type all of that because I just got home, booted up my computer, and it is now reading all 6GB.

Thanks anyways.

PC eye

I can imagine you already have SP1 on to now see the full amount being shown. Home Premium 64 is good upto 16gb from what seen at http://www.microsoft.com/windows/pro...ons/64bit.mspx

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tyttebøvs

SP1 does NOT solve the issue. It might change the display, but that is all.

Enabling remapping in bios is the only way. The precise name of the function depends on what board it is

Kewl Munky

The issue pretty much solved itself, so no reason for this thread to continue.

tyttebøvs

Is the issue also resolved if you look in the task manager?