16g内存条只有7.94可用怎么办(内存条可以8g和16g混装吗)

The reasons are as follows:

1. Although the computer has 16G of memory, the computer has 16G of memory. There are many operating systems or software that come with computers, and they occupy a large part of the memory, which is exactly 8.1G. Therefore, the memory available to the user is only 7.9G.

2. The computer's memory actually uses 16G, but the user can only see that 7.9G is used. This is because there are many hidden files in the computer. Although they are not displayed and generally invisible, they still occupy 8.1G of memory.

Only by displaying the hidden files through operation, can the user see the memory actually used. If you delete these hidden files, the available memory will increase.

The above is the reason why the computer has 16G of memory, but can only use 7.9G of memory.

Extended information:

Memory is classified according to its working principle:

1. Read-only memory (ROM)

ROM means read-only memory (ReadOnlyMemory), when the ROM is manufactured, the information (data or program) is stored and permanently saved. This information can only be read and generally cannot be written. Even if the machine is powered off, the data will not be lost. ROM is generally used to store basic computer programs and data, such as BIOSROM. Its physical appearance is generally a dual in-line plug-in (DIP) integrated block.

The more popular read-only memory now is flash memory (FlashMemory), which is an upgrade of EEPROM (electrically erasable programmable read-only memory) and can be erased and written repeatedly through electrical principles. Most BIOS programs are now stored in the FlashROM chip. USB flash drives and solid-state drives (SSD) are also made using the principle of flash memory.

2. Random Access Memory (RAM)

Random Access Memory means that data can be read from or written to. When the machine is powered off, the data stored in it is lost. The memory module we usually buy or upgrade is used as computer memory. The memory module (SIMM) is a small circuit board that collects RAM integrated blocks. It is inserted into the memory slot in the computer to reduce RAM integration. The space occupied by the block. Common memory modules currently on the market include 1G/module, 2G/module, 4G/module, etc.

Reference source:

Baidu Encyclopedia-Memory

The motherboard does not support it. The motherboard chip is determined, your processor determines the maximum installed memory capacity, and the maximum capacity of a single memory stick.

It shows that there is 16G of memory, but only 12G is available. There are two main possibilities.
1. The memory capacity is limited in the settings. Generally, you need to run msconfig to remove the maximum memory limit in the figure below. 2. The memory module is not inserted properly. There is a lot of feedback online. When the memory modules are not all inserted, the capacity can be recognized when the computer is turned on, but the available memory is limited. Generally, it can be solved by re-inserting the memory.
3. It does not rule out the possibility of viruses or important system files being damaged. If the above method cannot solve the problem, you can try reinstalling the system.

There are four reasons. 1. It is a problem with your system, which is not 64-bit. Some 32-bit systems can be identified by installing a memory expansion software. 8G memory; 2. Maybe you are using an integrated network card, which also takes up memory. If you calculate it this way, your network card will occupy about 8G, which seems unlikely; 3. If you do not have a single 16G, the memory in your chassis The memory card slot may be broken, causing some memory modules to not be recognized. 4. You were fooled when buying memory.