RAM
I have a computer which has an ASUS P5B motherboard and an Intel Pentium D
Processor and runs Windows XP.
It has 4GB of DDR2 RAM (4 x 1GB). All RAM chips are of the same type and
manufucturer. In BIOS setup, when i go to "system information" it shows that
the pc has 3GB of RAM instead of 4 and In Windows XP, in "System properties"
window (right click on my computer -> properties) it shows 2,93 GB of RAM.
But in "System Information" (Start menu -> All programs -> Accessories ->
System tools -> System Information) It says
Total Physical Memory: 4,096.00 MB
Available Physical Memory: 2,44 GB
Why the computer only uses 3GB of RAM ?
Is there a maximum for the amount of RAM memory which can be
used in Windows XP ?
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SOLUTION
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Think of memory addresses as phone numbers in a phone book.
For our puropse 1Gb = 1000 numbers.
Numbers 1 to 3000 (first 3 GB)
These are listed in the book if used.
Numbers 3001 to 4000 (4th Gb block)
Are numbers reserved for special uses and not 'listed' in the phone book even if used.
These 'phone numbers' are 'reserved' for this regardless of how many numbers are in the book.
Numbers 4001 and up (over 4 Gb)
Are available for use but they cannot be -listed- in the phone book.
(So if you wanna call one of these phones you have to already know the number.)
~~~
"system information"
-- Can only show you -listed- phone -numbers-. (Memory addresses allocated for the operating system)
-- It does not show all the -phones- being used. (Memory actually being used.)
.