CPU frequency doubling

The frequency doubling of the CPU. There is a ratio between the core operating frequency of the CPU and the external frequency, which is the multiplier coefficient. In theory, the frequency doubling is from 1.5 to infinite, but note that the frequency doubling is an interval of 0.5. The frequency is multiplied by the multiplier, so any increase can increase the CPU frequency.

In the past, there was no concept of Frequency Doubling. The clock speed of the CPU is the same as that of the system bus, but the CPU speed is getting faster and faster, and the frequency doubling technology is acceptable. It enables the system bus to work at a relatively low frequency, and the CPU speed can be infinitely increased by doubling. Then the CPU clock speed is calculated as follows: clock speed = External frequency (LW: External frequency can be understood as the FSB frequency of the front-end system bus) x multiplier. That is, the frequency doubling refers to a multiple of the differences between the CPU and the system bus. When the external frequency remains unchanged, the frequency doubling increases, and the CPU clock speed increases.

The external frequency and the front-end bus (FSB) frequency are easily confused. The speed of the front-end bus refers to the speed of the bus between the CPU and the chip of the North Bridge. It also represents the speed of CPU and external data transmission. The concept of external frequency is based on the fluctuation speed of Digital pulse signals. That is to say, a 10 thousand MHz external frequency refers to a digital pulse signal that oscillates million times per second, it affects the frequency of PCI and other bus. The two concepts of Front-End bus and outer frequency are confusing, mainly because during a long period of time (mainly before the emergence of Pentium 4 and when the emergence of Pentium 4 ), the frequency of the front-end bus is the same as that of the outer frequency. Therefore, it is often called the front-end bus as the outer frequency, which leads to such misunderstanding. With the development of computer technology, it is found that the frequency of the front-end bus must be higher than that of the outer frequency. Therefore, QDR (quad date rate) technology or other similar technologies are used to achieve this purpose. The principles of these technologies are similar to the 2x or 4x of AGP. They make the front-end bus frequency twice, 4x, or even higher than the outer frequency, since then, the difference between the front-end bus and the external frequency has been paid attention.

The default external frequency of a CPU is only one, and the motherboard must support this external frequency. Therefore, you must pay attention to this when purchasing the motherboard and CPU. If the two do not match, the system will not work. In addition, many CPU frequencies have been locked, so extra-frequency is often required for overclocking. After the external frequency changes, many other frequencies of the system will change. In addition to the CPU clock speed, the frontend bus frequency, PCI, and other interface frequencies, including the hard disk interface frequencies, may change, causing the system to fail to run normally. Of course, some boards can provide the function of locking various interface frequencies, which is of great help to the success of overclocking. Overclocking is risky and may even damage computer hardware.