/ 3GB (from 4 GB) after the motherboard upgrade - how to get back my 1 GB?

I recently updated my motherboard and my Vista Ultimate update now recognizes only (mode ala pre service pack) 3 GB instead of 4 GB that is installed.

What can I do to recover my full 4 GB?

Hi cheese Switzerland.

If a computer has 4 gigabytes (GB) of memory installed RAM (RAM), system memory shown in the system dialog box information in Windows Vista is less than expect you.

This behavior is the expected result of some 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 is available for 32-bit operating systems, the MMIO space must reside in the first 4 GB of address space.

Follow the instructions in the link below that may help you resolve the issue.
System memory shown in the system information dialog box in Windows Vista is less than expected if the 4 GB of RAM is installed
http://support.Microsoft.com/kb/929605/en-us

Check whether the problem is resolved.

Please post back and let us know if it helped to solve your problem.

Kind regards
KarthiK TP

Tags: Windows

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