The 32-bit 64-bit operating system supports memory differences. Why does Win7 only display 4 GB memory ?, Win74g

The 32-bit 64-bit operating system supports memory differences. Why does Win7 only display 4 GB memory ?, Win74g

The WIN732-bit system can only recognize 4G memory while the 64-bit system can recognize 4G memory or above. The difference between 32-bit and 64-bit also involves the addressing of the memory. The maximum addressing space of a 32-bit system is 2 to the power of 32 =? 4 GB, and the maximum addressing space of the 64-bit system reaches the power of 64 to 2 = 0.1 billion GB. In other words, the 32-bit system processor only supports 4 GB memory at the maximum, the 64-bit system supports a maximum of hundreds of millions of digits of memory.

The CPU bit refers to the amount of data that can be processed at a time. 1 byte = 8 bits. A 32-bit processor can process 4 bytes of data at a time. Likewise, 64-bit processors can process 8 bytes of data at a time, doubling the processing speed of 32-bit processors. After nearly 30 years of testing, the processor has now jumped to 64-bit, which can increase the frequency from 1 GHz to 3 GHz. If the frequency increase is to increase the speed limit of a 4-lane expressway from 120 km to  km, the increase from 32-bit to 64-bit is to increase the speed limit of the highway by 3 times from 4 lanes to 8 lanes. That is to say, the highway's capacity is doubled, this is a qualitative leap.

Because the memory is composed of many small units, in order to obtain data in the memory, each unit needs to be numbered, just like the home address. The unit number used as the memory has a dedicated register storage (the professional term is mar). A 32-bit system can represent the maximum address of 2 to the power of 32, generally, a unit is 8 bits, that is, a byte. 4G storage space. The total number of cell addresses that can be expressed by the same 64-bit system is 64 of 2.

The manufacturer's standard is 1 GB = 1024 MB while the scientific standard is 1 GB = MB. As to why 64-bit is faster than 32-bit, it is because if a machine instruction is 32-bit, the register is 64-bit, and two instructions can be obtained at a time. The 64-bit instruction set is supported. It is equivalent to a child and an adult taking food. A child can only take four at a time, while an adult can take eight.

Now another problem arises, that is why my computer has 4 GB memory while the computer shows 3.xxg. In fact, because other storage devices also need space addresses, some addresses are allocated to other storage devices, so the memory address is reduced, and the recognized memory is naturally less than 4 GB. This is different from the hard disk. the actual capacity of the hard disk is less than the calibration capacity because it is convenient for industrial production. the manufacturer's standard is 1 GB = 1024 MB, while the scientific standard is 1 GB = MB.

This is different from the hard disk. the actual capacity of the hard disk is less than the calibration capacity because it is convenient for industrial production. Why is the 64-bit speed faster than the 32-bit speed, that's because if a machine command is 32-bit, then the register is 64-bit and two commands can be obtained at a time, which is equivalent to a child and an adult grabbing food. A child can only take four at a time, adults can have eight.