32-bit Windows cannot address more than 4G of memory.  Beyond that, 4G is the hardware limit for your system, even with a 64-bit OS -- if you need more RAM for whatever reason, it's time for a new system.
Hello helper, I am trying to upgrade my laptop's ram from 2GB DDR2 to 8GB DDR2. My specifications: Intel Pentium Dual Core CPU T4200 2.00Ghz 32 bit OPERATING SYSTEM , x64 based processor - I am wondering if it is possible to upgrade it to 8GB since I have a x64 based processor or do I need a 64 bit os as well to upgrade it? By the way, the laptop doesn't have an NVIDIA graphics card but only has an integrated intel gpu. It has one 2GB stick installed while the other slot is empty. Do I need to replace the 2GB one with a 4GB so I can add another 4GB which makes it 8GB in total? That's all, further details ...you are welcomed to ask me !
DELL INSPIRON 1440 - RAM UPGRADE