What is the concept of 300 in the Pentium 300?

Broadly speaking, this is how often (speed) the CPU processes data. The more often the data is processed, the more calculations the CPU can do per unit of time, and the higher its work efficiency will be.

300MHz refers to this frequency (the main frequency of the CPU), and the current CPU is generally 2GHz to 3GHz, which usually refers to the main frequency of the CPU.

300MHz translates to a lot worse than the current mainstream CPU frequency.

1GHz=1024MHz=1048576KHZ100,000,000,000,000,000,000,000,000,000,000,000,000,000,000,0

It is the clock frequency of the CPU, which is simply the abbreviation of the operating frequency of the CPU (the number of synchronization pulses that occur in 1 second) during CPU operation. The unit is Hz.

It determines the running speed of the computer, and with the development of the computer, the main frequency has developed from the past MHz to the current GHz (1G=1024M). Generally speaking, in the same series of microprocessors, the higher the frequency, the faster the computer, but for different types of processors, it can only be used as a reference. In addition, the computing speed of the CPU also depends on the performance indicators of all aspects of the CPU pipeline.

Since the main frequency does not directly represent the computing speed, in some cases, it is likely that the actual computing speed of the CPU with a higher frequency will be lower. Therefore, the clock speed is only one aspect of CPU performance, and does not represent the overall performance of the CPU.

When it comes to the processor frequency, it is necessary to mention two concepts closely related to it: frequency doubling and external frequency, the external frequency is the base frequency of the CPU, and the unit is also MHz. The external frequency is the speed of synchronous operation between the CPU and the motherboard, and the external frequency of most of the current computer systems is also the speed of synchronous operation between the memory and the motherboard. The frequency doubling is the multiple of the ratio of the main frequency to the external frequency.

Main frequency, external frequency, frequency doubling, and their relational formula: main frequency, external frequency, frequency doubling. In the early days, CPUs did not have the concept of "frequency doubling", when the main frequency and the speed of the system bus were the same.

With the development of technology, the CPU speed is getting faster and faster, and accessories such as memory and hard disks can gradually not keep up with the speed of the CPU, and the emergence of frequency doubling solves this problem, which can make the memory and other components still work at a relatively low system bus frequency, and the main frequency of the CPU can be infinitely increased by frequency doubling (theoretically). We can regard the external frequency as a production line in the machine, and the frequency doubling is the number of production lines, and the speed of a machine's production speed (main frequency) is naturally the speed of the production line (external frequency) multiplied by the number of production lines (frequency doubling). Nowadays, manufacturers have basically locked the frequency doubling, and the only way to overclock is to start with the external frequency, and use the combination of frequency doubling and external frequency to jumper the motherboard or set soft overclocking in the BIOS, so as to achieve a partial improvement in the overall performance of the computer.

So when buying, try to pay attention to the external frequency of the CPU.

It's the same thing as the CPU frequency and now P4.

Mercedes etc. refer to:

Engine displacement calibration, 200 refers to its engine displacement refers to its engine displacement is.

Example: Mercedes S500

The first letter refers to the class, and the following number refers to the displacement, and the S500 is the displacement of the S-class.

The main reasons why the Mercedes-Benz 300 car cannot catch fire: 1. The battery loss is that the starter starts to rotate but the speed is not enough, that is, it is weak, and then the starter only clicks and does not turn. Low temperature in winter and forgetting to turn off individual electrical equipment will cause the vehicle to be unable to start, especially in winter for long-term short-distance low-speed use, the battery voltage will be lower than the rated value, starting and unable to operate normally.

2. The flow of gasoline is blocked, do not wait for the gasoline to burn out before refueling, and there is no oil pressure in the oil supply pipe of the engine. This situation usually occurs in the morning when the temperature is very low, and is caused by long-term dirt in the fuel line. When the temperature is very low, the water mixes with debris and the fuel line is blocked, and as a result, it cannot be started.

3. The ignition system is not in good working condition, especially in cold weather, due to the low intake temperature, the fuel is not atomized well in the cylinder, if the ignition energy is insufficient, the result will be flooding, that is, too much fuel accumulates in the cylinder, exceeding the fire limit concentration and can not land. Mercedes-Benz 300 car can not catch fire inspection method: 1. Check the valve clearance, if it is not right, it needs to be adjusted.

2. Check the spark plug to see if the model is correct and whether the electrode gap is in between. Observing the combustion condition at the same time helps to judge the adjustment of the carburetor. It is strongly recommended to select high-quality spark plugs imported from land, with correct calorific value, and beware of counterfeiting.

3. Measure the compression ratio, if there is no cylinder pressure gauge, cover the spark plug hole with a thin piece of paper, if the paper piece is sucked more violently when starting, even if it is OK. You can make your own air valve on the spark plug hole and use the pump to check for air leakage. 4. Oil circuit inspection.

It is better to remove the fuel tank and use a container to force the oil to be fed, because there is a possibility that the negative pressure tank switch will fail. In addition, look at the interface glue between the carburetor and the engine to see if there is any air leakage.