1 memory type
Conceptually, the video memory used in a graphics card is a subset of memory. In general, there are two types of memory: SDR (single data rate) and DDR (double data rate), which convert data twice per frequency cycle. As early as the graphics card was launched, SDR was eliminated. Since DDR is twice as efficient as SDR, it is important to note that all DDR memory often doubles the actual frequency speed in advertising.
For example, DDR is often referred to as "1000 MHz DDR" memory (meaning 1000 MHz performance), but the actual frequency speed is 500 MHz.
Therefore, many people are surprised to see that the 1200 MHz DDR graphics card has been reported to have a transmission speed of only 600 MHz, but this is not the point of caution, as this is only the frequency speed at which DDR is reported. The operation of DDR2 and GDDR3 memory is the same in principle. It is double the frequency speed. The difference between DDR, DDR2 and GDDR3 is only in manufacturing technology. Generally speaking, DDR2 is faster than DDR, and DDR3 is faster than DDR2. Faster.
2 memory frequency
Like the graphics processor GPU, the memory operates at a certain frequency speed and is measured in megahertz (MHz). Similarly, increasing the memory frequency can significantly improve the memory performance. From this perspective, the number of memory frequencies is one of several numbers that can be used to compare memory performance. For example, assuming other factors (such as the memory bus width) are the same, when comparing the 500 MHz memory frequency and the 700 MHz memory frequency of the graphics card, it can be reasonably inferred that the graphics card with a memory frequency of 700 MHz will have better performance.
However, it must be clear that the memory frequency is not the only indicator that determines the performance of the graphics card or the memory performance of the graphics card. 64-bit bus, 700 MHz memory card, slower than 128-bit bus, 400 MHz memory card. The 128-bit bus has a frequency of 400 MHz, which is about the same speed as the 64-bit bus at 800 MHz. In addition, it must be noted that the core frequency of the GPU and the memory frequency are two completely different concepts.
3 graphics interface
All data transfer between the graphics card and other components of the computer passes through the graphics card slot or interface. There are currently three types of graphics card interfaces: PCI, AGP, and PCI Express. Different graphics cards have different data bandwidths, and the higher the bandwidth, the better the performance of the corresponding graphics card. In many cases, the bandwidth of communication between the graphics card and other components such as the motherboard and CPU is often a bottleneck that restricts the performance of the graphics card.
The slowest graphics card bus, the non-old PCI bus (Peripheral Components Interconnect) is the same; and the graphics acceleration port (AGP, Accelerated Graphics Port) performs much better, but the AGP 1.0 and AGP 2x specifications, its data bandwidth is still too Too low to limit the performance of the graphics card, but once you use AGP 4x, you can achieve the actual maximum bandwidth required by the current graphics card; AGP 8x bandwidth is twice the AGP 4x specification (2.16 GB / s), but these two There is a slight difference in performance between the standards.
4HDR Lighting: High dynamic lighting rendering
HDR is the abbreviation of "High Dynamic Range.". Games that support HDR lighting rendering technology can display real images better than games that do not support HDR, but not all graphics cards can display HDR graphics.
5 anti-aliasing: Anti-Aliasing
Aliasing is a term that describes the jagged or block corners that appear when a graphic is rendered. It refers to the stepped corners that appear in the screen graphics; anti-aliasing (AA: Anti-aliasing) can effectively cope with this. a phenomenon. However, since anti-aliasing uses a large amount of computing resources, it causes frame speed to drop.
At the same time, anti-aliasing technology is also limited by the graphics card memory performance. In general, compared with low-end graphics cards, graphics cards equipped with high-performance graphics memory are much better when performing anti-aliasing.
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