Win7 system computer Why 8g memory only 4g available

Win7 system computer Why 8g memory only 4g available, computer available memory is lower than the actual? Believe that this is a lot of users of the query, after installing the Win7 system, found that the computer configuration of the 8G memory is only shown as 4G of memory available, this is how it? Where's the other 4 G memory? ? The following small series and everyone together to analyze the specific reasons!

Win7 system it is divided into 32-bit and 64-bit systems, many of the computer unfamiliar friends may not know what the difference between win732 and 64-bit? Recommended: Win7 system 32-bit and 64-bit difference

For a Win7 32-bit system, the maximum memory it can support is 2 of 32 times = 4294967296 (bit) = 4 (GB). Your memory can only support 4G size of memory, so no matter your memory size is greater than 4G, it can only detect the available memory 4G or so. If your win7 system is 64 bits, then it's not the same, it can support more than 100 million GB of memory. So when you have more than 4G of RAM, you can only install the Win7 64-bit system to fully utilize the computer's memory.

Now basically most applications are compatible with 64-bit systems. Instead, some applications must have 64 bits to support it. Of course, as to whether you are installing win7 number of digits system, make your own decision. Believe that through the above sharing, we will no longer 8G memory computer can only recognize 4G memory generated confusion!