QUOTE(kangyoon20 @ Apr 20 2012, 07:41 PM)
now only i know W7 32bit can only use 4G RAM max
so my free 8G upgrade is totally useless
after the GPU 1GB ram reserved, my system only have 2.74G usable ram show in system properties
and with just firefox running now, my L755 already constantly using 1.3G, about 50% of my ram...
is this normal?
Yeap, all Toshiba units come with W7 32-bit at 1st (well, most sellers will choose to startup W7 with 32-bit to save time during purchasing)....
Usually its less than 3GB RAM (mine was 2.98GB) usable for a 32-bit system...
Still, no worries since you can still change your windows version to 64-bit yo

The protocol (written by me, a long time ago) is here

» Click to show Spoiler - click again to hide... «
Dear Toshiba users,
It seems lately nearly all Toshiba notebooks are equipped with both 32-bit Operating systems (Windows for this case) as well as 64-bit Operating systems (which are installed into the hidden HDD partitions of each notebook). Notebook sellers prefer to start up the whole notebook with 32-bit OS , mostly because of the shorter time required to boot the whole system. Since 32-bit OS can only support around 2.98GB of RAM, those who bought Toshiba notebooks with RAM upgrades (to 4GB RAM- models include Satellite L510, Satellite Pro L510, M500, M300, T130, F60 etc.) will not be able to fully utilize the RAM. This can be settled by converting your 32-bit OS to 64-bit OS. You can do it via recovery from the Toshiba hidden partition itself, or via the 4 system recovery discs that you burnt when you 1st got your notebook
The guide to Toshiba's HDD system recovery can be found here: cdgenp01.csd.toshiba.com/content/.../PMA500339010_web.pdf
Generally, it would be easier to conduct the recovery from the Hidden partition than the recovery discs (noneed to keep on changing discs XD )
In general, the steps involved are:
1. Make sure you backup all important files, EVERYTHING will be reformatted (except the Hidden Partition) when you recover your system. Noneed to worry about drivers and Toshiba programs as they are included in the Hidden Partition/Recovery discs.
2. Plug in A/C adapter and if possible, plug in the battery just in case of blackouts (in Malaysia) XD
3. Shut down your notebook.
4. Press and hold the "0" and the "power" button. A window will appear asking you whether you want to load a 32-bit or 64-bit windows. The remaining will be easy, just choose the "recover to out-of-box state" (Actually noneed to change anything, as for the subsequent windows, the initial ticked box will be the recommended one) XD
5. Partition reformatting will commence. Initiate the next step.
6. After that, leave everything to your notebook, it will restart on its own for quite a few times (to install the drivers and programs), may take up to 1-2 hours depending on your system. You will be configuring your OS in no time.
I guess that's all, hopefully this will help those who wanted to switched to 64-bit OS
Anyway, Do refer to the link above for more elaborated details
Best of luck!
This post has been edited by [PF] T.J.: Apr 20 2012, 10:49 PM