What is the frequency of the CPU

CPU's frequency, that is, CPU core working clock rate (CPU Clock Speed). It is commonly said that a certain CPU is how many MHz, and this number of MHz is "CPU frequency." Many people think that CPU is the speed of its operation, but it is not. The CPU's frequency indicates that the speed of the digital pulse signal oscillation in the CPU is not directly related to the actual computational ability of the CPU. There is a certain relationship between the frequency and the actual operation speed, but there is not a definite formula to quantify the numerical relationship between the two, because the CPU's operation speed also depends on the CPU's line of performance indicators (cache, instruction set, CPU number of bits, etc.). Because the frequency does not directly represent the speed of operation, so under certain circumstances, it is likely to have a higher frequency CPU actual operation speed is low. For example, AMD's ATHLONXP series of CPUs are mostly able to lower the frequency of the Intel Company's Pentium 4 series CPU high CPU performance, so the ATHLONXP series of CPUs to the PR value of the way to name. Therefore, the frequency is only one aspect of CPU performance, and does not represent the overall performance of the CPU.

CPU frequency does not represent the speed of the CPU, but to improve the speed of the CPU is crucial. For example, suppose a CPU executes an operation instruction within a clock cycle, and when the CPU is running at 100MHZ, it will be one times faster than when it runs at 50MHz. Because the clock cycle of 100MHz is less than 50MHz of the clock cycle takes up half the time, that is, work in the 100MHz frequency of the CPU to perform an operation command time only for 10ns than the work in the 50MHz frequency of the 20ns shortened by half, the natural operation speed is one times faster. But the overall speed of the computer not only depends on the CPU speed, but also with the operation of other systems, only in the improvement of the frequency, the operating speed of each system and the data transmission speed between the various systems can be improved, the overall speed of the computer can be really improved.

The main frequency of CPU work is limited by production technology. Because the CPU is manufactured on the semiconductor wafer, the components on the wafer need to be connected between the wires, because in the high frequency of the requirements of the wire thinner and shorter the better, so as to reduce the conductor distribution capacitance and other stray interference to ensure that the CPU operation is correct. Therefore, the limitation of manufacturing process is one of the biggest obstacles to the development of CPU frequency.

Memory frequency is the same as CPU frequency, is used to represent the speed of memory, it represents the maximum operating frequency that memory can achieve. The memory frequency is measured in MHz (MHz). The higher the memory frequency is to a certain extent, the faster the memory can reach. The frequency of memory determines how often the memory can work correctly. The current more mainstream memory frequency is 667MHz and 800MHz of DDR2 memory, as well as 1333MHz of DDR3 memory. The more high-end to GHz computing, such as high-end business needs of the frequency ≥2.4ghz.

When it comes to processor frequency, mention the two closely related concepts: Frequency multiplier and FSB, FSB is the benchmark frequency of the CPU, and the unit is MHz. FSB is the speed at which the CPU runs synchronously with the motherboard, and most of the current computer system FSB is also memory and the speed of synchronization between the motherboard, in this way, can be understood as the CPU FSB directly with the memory connection, to achieve the synchronous operation between the two states, frequency is the frequency and the ratio of the FSB of multiples. Frequency, FSB, frequency multiplier, its relational type: the clock frequency = FSB x times frequency. The early CPUs did not have the "multiplier" concept, when the speed of the system bus was the same.

With the development of technology, the CPU speed is getting faster, memory, hard disk and other accessories gradually can't keep up with the speed of the CPU, and the advent of frequency multiplier solves this problem, it can make the memory and other parts still work in the relatively low system bus frequency, and the CPU's main frequency can be multiplied by the frequency of infinite ascension (theoretically). We can think of FSB as a production line in the machine, and frequency doubling is the number of lines, a machine production speed (frequency) is naturally the speed of production line (FSB) multiplied by the line number (multiplier). Now the manufacturers have basically already put the frequency of the lock dead, to overclocking only from the FSB, through the frequency multiplier and FSB to the board jumper or set in the BIOS soft overclocking, so as to achieve the overall performance of the computer part of the upgrade. So in the purchase of the time to pay attention to the CPU FSB.