Do you get really 4 GB of memory in 64-bit Windows?

I have improved my T400 to the edition of Windows 7 x 64 recently, and I also intend to add more memory (I have only 3 GB currently)

But it seems that there is always a limit for usable in Windows 64-bit memory:

When I check the system information, Windows reports that there only 2.9 GB of usable memory although it has 3GB installed. And the Task Manager shows 2966 MB of memory in total.

I googled the problem, it seems that the devices still occupy the memory address 3GB - 4GB, and it needs "remapping memory" taken supported by BIOS to make use of all of the memory. I updated the BIOS to the last, but I could not find this option in the BIOS. (Here's a link about this problem from Microsoft: http://support.microsoft.com/kb/929605)

Did you guys a similar problem?

Windows 7 64 bit also has memory limits, but this isn't anything you need to worry.

Here are the limits for 32-bit and 64-bit Windows 7

32 - bit 64-bit version

Windows 7 Ultimate

4 GB

192GO

Windows 7 business

4 GB

192GO

Windows 7 Professional

4 GB

192GO

Windows 7 Home Premium

4 GB

16 GB

Windows 7 Home Basic

4 GB

8 GB

Windows 7 Starter

2 GB

2 GB

Please note that the Intel integrated graphics using your system memory and as a result, you will not be able to use the memory allocated to the IGP [Intel graphics].

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