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I have a Sony VGC-LT25
Ii came with 3 GB of memory installed (1 GB,and 2GB modules)
I replaced the 1 GB module with a 2 GB module bringing the memory up to 4 GB total
On the System control panel the system shows 4GB total installed but reads (3 GB usuable)
What does this mean and is there some setting I need to change to allow for the full 4GB to be usable?
If your OS is 32-bit XP or Vista, the system can only use 3-3.57GB of memory.
32-bit Windows 7 "sees" 4GB but in that case, some of the RAM may be unusable because it is reserved for graphics use.