The overclocking of the computer is to improve the working frequency of the CPU, graphics and other hardware by artificial way, so that they work stably under the rated frequency state. The Intel P4C 2.4GHz CPU For example, its rated operating frequency is 2.4GHz, if the operating frequency to 2.6GHz, the system can still run stably, then the overclocking was successful.
The main purpose of CPU overclocking is to improve the CPU's operating frequency, that is, the CPU's central frequency. The CPU's frequency is also the product of FSB and frequency multiplier. For example, a CPU FSB 100MHz, frequency multiplier of 8.5, you can calculate its frequency = FSB x frequency multiplier =100mhzx8.5 = 850MHz.
The frequency of the CPU can be increased by changing the CPU frequency multiplier or FSB to achieve. But if you're using an Intel CPU, you can ignore the multiplier because Intelcpu uses a special manufacturing process to prevent it from changing the multiplier. AMD can modify the CPU frequency multiplier, but the modification of the CPU performance of the multiplier is not better than FSB.
The speed of FSB is usually closely associated with the speed of the front-end bus and memory. So when you raise the CPU FSB, the performance of the CPU, system, and memory also increases.
There are two main ways of CPU overclocking:
One is hardware settings and the other is software settings. Hardware settings are more commonly used, it is divided into jumper settings and BIOS settings two kinds.
1. Jumper Set overclocking
Most early motherboards used a jumper or dip switch to set the method for overclocking. In the vicinity of these jumpers and dip switches, a number of forms are often printed on the motherboard, documenting the functions defined by the jumper and dip switch combinations. In the shutdown state, you can set according to the frequency of the table. After the reboot, if the computer starts normally and can run stably, it means our overclocking is successful.
For example, an Intel 845D chipset board that works with Celeron 1.7GHz, it uses jumper overclocking. In the inductor coil below, we can see the jumper table, when the jumper is set to 1-2 of the way when the FSB is 100MHz, and changed to 2-3 of the way, the FSB is promoted to 133MHz. The Celeron 1.7GHz default FSB is 100MHz, we just upgrade the FSB to 133MHz, the original Celeron 1.7GHz will be overclocking to 2.2GHz work, is not very simple:).
Another piece with the AMD CPU using the VIA KT266 chipset motherboard, using the DIP switch set the way to set the CPU frequency multiplier. Most AMD has no multiple frequencies locked, so it can be overclocking by modifying the frequency multiplier. This is a five-group dip switch, which can be combined to form more than 10 modes through different On-off states of each serial number switch. A description table is printed on the upper right of the dip switch, which shows that the dip switch brings different frequency changes under different combination modes.
For example, we have an AMD 1800+ to Overclocking, first of all, to know that Athlon XP 1800+ frequency is equal to 133MHz FSB x11.5 multiplier. As long as we increase the frequency of 12.5,cpu to become 133mhzx12.5≈1.6ghz, the equivalent of Athlon XP 2000 +. If we increase the frequency multiplier to 13.5, CPU frequency becomes 1.8GHz, also will Athlon XP 1800+ Overclocking became Athlon xp2200+, simple operation in exchange for the performance of a great upgrade, very interesting it.
2.BIOS Set overclocking
Now mainstream motherboards basically give up the jumper settings and dip switch settings to change the CPU frequency multiplier or FSB, but use more convenient BIOS settings.
For example, the Softmenu III and Pan positive (epox) Powerbios, such as the BIOS overclocking mode, in the CPU parameter settings can be CPU frequency multiplier, FSB settings. If you encounter overclocking after the computer does not start the situation, as long as the shutdown and hold down the INS or home keys, reboot, the computer will automatically revert to the CPU default working state, so or in the BIOS overclocking better.
Here is the NF7 motherboard and Athlon XP 1800+ CPU combination scheme to achieve this overclocking combat. Currently there are two main BIOS brands in the market, one is the Phoenix-award bios, and the other is the AMI bios, which takes the award BIOS as an example.
First start the computer, press del key to enter the motherboard BIOS settings interface. Select Soft Menu III Setup from the BIOS, which is the Softmenu overclocking feature of the upgrade board.
After entering this function, we can see that the system automatically recognizes the CPU as 1800 +. We want to return here by changing the default recognized model to user Define (manual setting) mode. When set to Manual mode, the original gray-not-selectable CPU FSB and multiplier is now an optional state.
If you need to use elevated FSB to overclocking, return to the external Clock:133mhz. There are a lot of FSB to adjust, you can adjust it to 150MHz or higher frequency options. Because the elevated FSB will increase the system bus frequency and affect the stability of other equipment, it is important to adopt a method of locking the PCI frequency.
Multiplier factor is to adjust the CPU frequency of the place, enter the last entry area, can be based on the actual CPU to choose the frequency multiplier, such as 12.5, 13.5 or higher frequency multiplier.
Q: If the CPU overclocking after the system does not start or work is not stable, I heard that the CPU can improve the core voltage to solve, there is this reason?
Answer: Yes. Because the CPU is overclocking, the power consumption is increased. If the supply current remains unchanged, some CPUs will be unable to work properly and stably due to low power consumption. When the voltage is raised, the CPU gains more power and makes overclocking easier to succeed and stabilize.
The core voltage of the CPU can be set and adjusted in the BIOS. Under normal circumstances, you can select the default state. If the CPU overclocking after the system is unstable, you can give the CPU core voltage. But the side effect of the voltage is very large, the first CPU calorific value will increase, and then the voltage added too high is easy to burn the CPU, so the voltage must be cautious, generally 0.025V, 0.05V or 0.1V step up add on it.
3. Use software to achieve overclocking
As the name suggests, is through the software to overclocking. This overclocking is simpler, it is characterized by the frequency of shutdown or restart after the computer will be restored, rookie if not to achieve the hardware set overclocking, you can first use the Software overclocking test overclocking effect. The most common overclocking software includes SOFTFSB and software developed by each motherboard manufacturer. They all have the same principle, all by controlling the frequency of the clock generator to achieve the purpose of overclocking.
SOFTFSB is a more general software that can support dozens of kinds of clock generators. As long as the motherboard on the use of the clock generator model to choose, click Get FSB to obtain control of the clock generator, then you can use the frequency lever to the set of Overclocking, selected after press save can let the CPU according to the new set of frequency to start work. However, the disadvantage of the software overclocking is that when you set the frequency of the CPU can not afford the time, in your click to save that moment cause the panic or system crashes.
1.CPU overclocking and the CPU itself "physical" related
Many friends said that their CPU after the pressure overclocking is still unstable, this is the "physique" problem. For the same model of CPUs in different cycles of production of the different, these can be reflected from the processor number.
2. Double frequency low CPU good super
We know that improve CPU FSB than improve CPU frequency multiplier performance faster, if it is not locked frequency of the CPU, the Masters will use to improve the FSB to reduce the frequency multiplier method to achieve better results, resulting in a low frequency CPU with congenital advantages. such as overclocking AMD Athlon xp1700+/1800+ and Intel Celeron 2.0GHz.
3. The more advanced the production process, the better super
The more advanced the processing of the CPU, in the overclocking can achieve a higher frequency. For example, Intel's new Intel Celeron D processor, with its 90 nm manufacturing process, Prescott Core, has won wide attention. Already have Netizen will a fast 2.53GHz of Celeron D exceed to 4.4GHz.
4. Temperature has a decisive effect on overclocking
We know that after overclocking the CPU temperature will be greatly improved, equipped with a good cooling system is necessary. This not only refers to the CPU fan, as well as chassis fans. In addition, a thin layer of silicone grease on the CPU core is also important to help the CPU good heat dissipation.
5. Motherboard is a sharp tool for overclocking
A motherboard that can support overclocking well generally has the following advantages: (1) Support high FSB. (2) have a good power supply system. such as the use of three-phase power supply of the motherboard or CPU single power supply of the motherboard. (3) A motherboard with special protection. If the CPU fan is stopped when the power can be immediately cut off, some motherboards called it "burning technology." (4) Motherboards with special overclocking settings in the BIOS. (5) Excellent workmanship, preferably 6-layer PCB board.