The frequency of video memory refers to the frequency at which video memory works on the video card by default, and the unit is MHz. The frequency of video memory reflects the speed of video memory to some extent.
However, the performance of the graphics card is determined by the core frequency, memory, pixel pipeline and pixel filling rate. Therefore, in the case of different display cores, high core frequency does not mean that this graphics card has strong performance. For example, the core frequency of 9600PRO reaches 400MHz, which is higher than 380MHz of 9800PRO, but it is definitely better than 9600PRO in performance.
In the same level of chips, the higher the core frequency, the stronger the performance. Increasing the memory frequency is what we call overclocking, and the performance of the graphics card is improved, but the load and power consumption of the graphics card are also increased accordingly, which will lead to an increase in temperature and affect the life of the graphics card.
Extended data:
Graphics card overclocking is to improve performance by increasing the working frequency of graphics card core and video memory. Similar to CPU overclocking, the main means is to change the voltage and frequency of kernel and video memory. If we want to achieve a higher stable frequency, we must also strengthen the cooling system of the graphics card. However, overclocking may cause irreversible damage to the graphics card in any case.
Harm of overclocking:
Simply put: overclocking, high temperature, short life.
It is only the influence of frequency increase that makes MOS transistors in the chip jump more frequently. In the process of jumping, there is an intersection of current and voltage due to non-ideal factors, and heating power consumption is generated near this intersection.
Therefore, increasing the frequency is equivalent to increasing the cross point, thus increasing the equivalent current and improving the power consumption. However, the peak value of pulse current is the same for MOS transistors in the operation circuit, and even sometimes the limit peak value of the power module is lower than the original one, so the crystal lattice of MOS transistors will not be destroyed under the condition of constant temperature.
However, it should be noted that the increase of equivalent current means that the load of the power supply circuit inside and outside the chip increases, and the current on the extremely thin wire inside the chip increases. Therefore, when overclocking, it is necessary to increase the heat dissipation of the chip itself, check the heat generation of the peripheral circuit, and it is best to strengthen the heat dissipation of the peripheral circuit.
For most DIY players, the headache is how to grasp the direction and scale of overclocking. On this issue, the player's experience and hardware knowledge are very important conditions. The following lists some matters needing attention when overclocking the graphics card for reference only.
1. It is better to install the common driver provided by the graphics chip developer instead of the driver provided by the graphics card manufacturer, because the latter is often added, deleted or modified on the basis of the former, and there may be some problems with overclocking software.
2. In the case of the same overclocking amplitude, most tests prove that core overclocking can significantly improve the overall performance of the graphics card than video memory overclocking. However, in some special cases, such as the bit width of the graphics card is shrinking and the filling texture data is relatively large, the overclocking effect of the video memory will be more obvious than that of the core overclocking.
3. The frequency of core and memory should be kept in a certain proportion. If the frequency of one side is raised too high, the performance will not be greatly improved. This is because overclocking core can improve the polygon generation ability and pixel filling ability of graphics card in unit time, and shorten the period of modeling and rendering, while increasing memory frequency can ensure that the data throughput of "logistics" part of graphics card can not keep up with the efficient work of core.
Therefore, it can be concluded theoretically that in most cases, upgrading the core frequency will significantly improve the performance of the graphics card. At the same time, it can be inferred that because the memory bit width is in the "logistics" supply position, if the upgrading of the memory frequency far exceeds the upgrading of the core frequency, that is, if the core frequency cannot meet the application, it will not bring performance gain.
4. During overclocking, pay close attention to the temperature change of the graphics card chip. Many graphics chips themselves consume a lot of power, and the heat generated after overclocking will be even greater. Therefore, it is best to install additional fans or other effective cooling equipment before overclocking to avoid the graphics card chip from being burned due to excessive temperature.
5. Learn more about the overclocking information of the corresponding graphics card from all aspects, such as what range it can generally exceed, what range it can exceed at the highest, and which frequency it works at more stably. Knowing the overclocking information of graphics cards will play an important reference role in actual overclocking.
6. Most graphics cards can get about 5% ~ 20% performance improvement after overclocking. After overclocking to the highest frequency, if the test results with test software still show no or only a little improvement, it shows that the speed of graphics card chip is not the bottleneck of graphics card operation, but the real bottleneck is CPU. Changing to a CPU with higher frequency is the key to solve the problem.
7. When adjusting the video memory and kernel frequency, it is best not to raise it a lot at a time, but to adjust it several times at intervals of about 5MHz. If there is an error on the screen or a single pixel after pressing "Apply", please press the ESC key immediately to return to the frequency before adjustment.
References:
Baidu Encyclopedia-Memory Frequency