Celtic Coding Solutions Blog

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x64 Windows only 3.25GB of usable memory

Had 8GB of spare memory so popped it into an old Intel Core 2 Duo E4600 and installed Windows 7 x64 bit as the processor was x64 compatible.

Checked windows system and noticed it had 8GB (3.25GB usable).  Strange, so I upgraded the bios to the latest version and checked that it was seeing 8GB, which it was.

Fix:-

I noticed under msconfig.exe (just type it into search and you will find it, or usually under C:\Windows\System32)

Click "Boot" Tab

Click "Advanced options"

"Maximum Memory" was ticked - so I un-ticked it and rebooted

And now I have the full 8GB of ram available.


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