Today I inserted 4GB DDR2 RAM into my hp8510p laptop.
BIOS and CPU-Z can detect 4GB physical RAM.

Windows XP SP3 can only recognize 3GB.

Someone explained the reason in a post -
4 GB RAM in Windows XP
Ubuntu oneiric 32bit version can only use about 3GB too.
onega@ub-laptop:~/boost_1_48_0$ free -m
total used free shared buffers cached
Mem: 3025 2502 523 0 594 910
-/+ buffers/cache: 997 2028
Swap: 2047 0 2047
本文讨论了4GB DDR2内存条安装在HP 8510p笔记本电脑后,在BIOS和CPU-Z中能正确检测到4GB物理内存,但在Windows XP SP3和Ubuntu Oneiric 32位版本中只能识别使用约3GB的问题。
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