MY RAM IS 4GB BUT BUT COMPUTER SHOWS IT"INSTALLED MEMORY(RAM): 4GB(3.50GB USABLE)" CAN I CHANGE IT TO 100% USABLE?

your system uses 3 gb,you havent lost anything you have 3 gb dedicated ram and 3 gb useable ram

Please check the system usable memory in BIOS. You can define the share pattern of graphics memory & system memory according to your usage. Also check your operating system; Only 64bit operating systems will support more than 3GB

Turn the computer off.
Disconnect the AC power.
If it is a laptop, then remove the battery.
Open the case, to reveal the two sticks of RAM.
One of the sticks is either "defective" or it is not fully-and-correctly "seated" in its slot.
Remove one stick, leaving the other one still installed.
Connect the AC power, and start it up.
If you have removed the "good" stick, the computer will complain that there is _NO_ RAM that is working.
If you have removed the "bad" stick, it will start-up with 2GB of RAM.
Turn the computer off.
Disconnect the AC power.
Put the "bad" RAM back into the computer, and try again.
If it starts-up and shows 2GB, you can be certain that the one stick is "bad". Replace it.

Hi,

As far as I know, the machine supports 4GB of ram, so you purchase the ram modules from a pc parts dealer and install them inside the machine, removing the existing ram, there are 2 slots, so you need 2, 2GB cards.

You do not require any drivers or bios update.

Windows will need to be upgraded to 64Bit version if you wish to use the full capacity. as normal windows is limited to 3-3.75GB

Further questions? let me know.

i think u r using windows 32bit version thek can support only 4GB of memory,And memory includer grafix card ,ram motherboart etc so other 1.5GB is used by other hardware in your pc

Hello Matthew,

Only 64bit operating system can use more than 3.5gb. You have to install either Windows Vista Pro 64bit or Windows 7 64bit to get the extra memory. I know it sounds like waste but your system is operating just fine and will be very fast just as it is. The 64bit operating systems are good but if you use your system for games then don't go to 64bit. There are many things that won't work right on 64bit systems like some printer, scanners, sound cards and even some programs.

I hope this helps, if so please rate our solution.

Buddy
Corporate Computer
www.ccl-la.com

you probably cant, its more than likely a bios limitation. check you motherboard manual for maximum limits.

What you are seeing is correct. You have 4GB of physical RAM installed in the computer and it is being recognized properly by the BIOS. A 32-bit operating system can only address approximately 3.5GB of RAM. Vista may be rounding the number down to 3GB or if you are using on-board video, some of the RAM is being allocated for use by the video circuitry and is not reported as system memory. To see all of the installed RAM in your operaing system, you need to upgrade to a 64-bit version of Vista.

The maximum amount of memory that your system can use is actually limited in two ways — not only is there a maximum amount of memory that your computer motherboard can accept, there is also a maximum amount of memory that your operating system (OS) can accept.

For instance, when you install 4GB of memory in a 32-bit Windows system (the most common version; 64-bit systems are typically used only by high-end users), your system will see (and utilize) only 3GB or 3.5GB.
Relax, there isn't a problem with the memory. Windows allows for 4GB of memory to be addressed, but this isn't 100 percent the same as having 4GB of physical memory.

What happens is that some of the addressable memory (regardless of how much you have physically installed) is reserved for use by page files or by some of the devices that you are using, such as a graphics card, PCI card, integrated network connections, etc., so it's unavailable for use as normal main memory.

The amount of memory needed for these devices is calculated by your system at startup; if you haven't maxed out the memory in your system, it's invisible to you, and all your physical memory (the RAM that's installed) is available for use. However if you've maxed out the DRAM in your system, this amount will be deducted from your physical memory, so you can't use 100% of your DRAM.

The maximum memory limitation varies by operating system; for instance, the 4GB memory limitation doesn't exist in 64-bit versions of Windows.

Memory maximums for current Microsoft® Windows OSs include:

• Windows XP Home: 4GB
  
• Windows XP Professional: 4GB
  
• Windows XP 32-bit: 4GB
  
• Windows XP 64-bit: 128GB
  
• Windows Vista Home Basic: 4GB
  
• Windows Vista Home Basic 64-bit: 8GB
  
• Windows Vista Home Premium: 4GB
  
• Windows Vista Home Premium 64-bit: 16GB
  
• Windows Vista Ultimate: 4GB
  
• Windows Vista Ultimate 64-bit: 128GB+
  
• Windows Vista 32-bit: 4GB
  
• Windows Vista 64-bit: 128GB+