Using a 32-bit OS (Vista/XP) will only shows an amout of 3-3.5GB of RAM..this is because the 32-bit system only can show a max of 3GB of RAM but still the 4GB RAM can still be utilize in various ways by the laptop.

If you want to fully utilize a maximun of 4GB RAM and above, you might considering migrating to 64-bit OS...can try tha Win 7 RC 64-bit version to whether your system is compatible enough for a 64-bit system (here you'll see an amount of 4GB of RAM that you installed)

*just my 2 cents..

hi guys... this RAM u re talking is the RAM that we buy it at shop rite?
if i want 4GB then can i use two KINGSTON 800MHZ (2GB)?
coz i read on the manual of this lappy, its support up to 4GB but using the RAM that we required to buy from ACER(i forgot the name jor)
thx in advance..[COLOR=purple]

Any brand will do.
I have mine. It's working perfectly fine.

Now, answer my question please.