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Windows 7: Mixing ram 1gb ddr2 667 and 2gb ddr2 800


02 Nov 2011   #1

window 7 ultimate 32 bit
 
 
Mixing ram 1gb ddr2 667 and 2gb ddr2 800

Why is it that my cpu can only read 2gb?do i need to overclock/underclock the other ram?



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Mixing ram 1gb ddr2 667 and 2gb ddr2 800-ram.jpg  
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02 Nov 2011   #2

Windows 7 Home Premium 64bit
 
 

Since you did provide computer specs, I assume 1GB is allocated to onboard video memory.
My System SpecsSystem Spec
02 Nov 2011   #3

Microsoft Community Contributor Award Recipient

Win 7 Pro 64-bit
 
 

Hello retryme07 and welcome to Seven Forums.

This behavior is the expected result of certain hardware and software factors.

Various devices in a typical computer require memory-mapped access. This is known as memory-mapped I/O (MMIO). For the MMIO space to be available to 32-bit operating systems, the MMIO space must reside within the first 4 GB of address space.

For example, if you have a video card that has 256 MB of onboard memory, that memory must be mapped within the first 4 GB of address space. If 4 GB of system memory is already installed, part of that address space must be reserved by the graphics memory mapping. Graphics memory mapping overwrites a part of the system memory. These conditions reduce the total amount of system memory that is available to the operating system.

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

In plain English, a portion of any installed RAM is set aside for other uses.
My System SpecsSystem Spec
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02 Nov 2011   #4

Windows 7 Ultimate SP1 64-Bit
 
 

Mixing RAM of different speeds is not advisable and your current setup will run at the lower clock speed of 667 MHz.

You haven't posted your computer specs. Doing so will help us to help you.

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My System SpecsSystem Spec
02 Nov 2011   #5

window 7 ultimate 32 bit
 
 

here check this.maybe it can help


Attached Thumbnails
Mixing ram 1gb ddr2 667 and 2gb ddr2 800-ram2.jpg   Mixing ram 1gb ddr2 667 and 2gb ddr2 800-ram3.jpg  
My System SpecsSystem Spec
02 Nov 2011   #6

Windows 7 Ultimate SP1 64-Bit
 
 

I think Marsimar's comment has answered your query admirably.

Have you read the link he gave you?
My System SpecsSystem Spec
02 Nov 2011   #7

window 7 ultimate 32 bit
 
 

problem solved.. thx alot guys
My System SpecsSystem Spec
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 Mixing ram 1gb ddr2 667 and 2gb ddr2 800




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