What does cache and flash memory of a graphics card mean

The graphics card only has video memory, no cache, cache is available from CPU and hard disk, flash memory is what we call U disk, flash memory.

The cache is IE, so to speak, garbage.

Video Memory Type:

At present, there are three main types of video memory used in the market: SDRAM, DDR SDRAM, and DDR SGRAM.

SDRAM particles are currently mainly used in low-end graphics cards, with a frequency of no more than 200MHz, and it has no advantage over DDR in terms of performance and performance, so it is gradually replaced by DDR.

DDR SDRAM is an abbreviation for Double Data Rate SDRAM, which provides high operating frequency and excellent data processing performance.

DDR Sgram is a product specially designed by graphics card manufacturers to enhance graphics access processing and graphics control efficiency, and is derived from Synchronous Dynamic Random Access Memory (SDRAM). Sgram allows individual modifications or access to in-memory data on a per-block basis, and it works synchronously with the CPU to reduce the number of memory reads and increase the efficiency of the graphics controller.

The current mainstream in the market is DDR2 and DDR3. (Some graphics cards in ATI are GDDR4).

Bit width: The bit width of the video memory is the number of bits of data that can be transmitted in a clock cycle, and the larger the number of bits, the greater the amount of data that can be transmitted instantly, which is one of the important parameters of video memory. At present, there are 64-bit, 128-bit, 256-bit and 512-bit video memory bit width on the market, and people are accustomed to calling 64-bit graphics cards, 128-bit graphics cards and 256-bit graphics cards to refer to their corresponding memory bit widths.

Memory bandwidth Memory frequency x memory bit width 8, in the case of the same memory frequency, the memory bit width will determine the size of the memory bandwidth. For example, if the same memory frequency is 500MHz for 128-bit and 256-bit memory, then the memory bandwidth of both will be as follows:

128-bit 500MHz*128 8=8GB s, while 256-bit 500MHz*256 8=16GBs are twice as large as 128-bit, which shows the importance of memory bit width in video memory data. The video memory of the graphics card is composed of video memory chips, and the total bit width of the video memory is also composed of the bit width of the video memory particles. Memory bit width Memory particle bit width Number of memory particles.

The memory particles are equipped with the memory number of the relevant manufacturer, you can go to the Internet to find its number, you can understand its bit width, and then multiply it by the number of memory particles to get the bit width of the graphics card.

Capacity: This is easier to understand, the larger the capacity, the more things can be stored, and of course, the better.

At present, the mainstream video memory capacity is 64MB, 128MB, 256MB, 512MB, etc.

Classification: No classification.

Parsing: L2 cache is some of the buffer memory inside the processor. There are two types of chips: the internal L2 cache runs at the same speed as the main frequency, while the external L2 cache is only half the main frequency.

Due to the limitation of L1 cache capacity, in order to increase the computing speed of the CPU again, a high-speed memory, that is, L2 cache, is placed outside the CPU.

The main frequency of L2 cache operation is more flexible, and the frequency can be the same as the CPU, or it can be different. When the CPU reads data, it looks first in the L1 cache, then from the L2 cache, then the memory, and then the external memory. Therefore, the impact of L2 caching on the system cannot be ignored.

The result of heavy use of L2 cache is a disproportionate increase in processor efficiency and cost**.

For example, the core of the Xeon processor used on the server is basically the same as that of the ordinary P4 processor, but the L2 cache is different. Xeon's L2 cache is 2MB 16MB, and P4's L2 cache is 512KB, so the cheapest Xeon is also more expensive than the most expensive P4, because the L2 cache is different.

Graphics cards are also known as display adaptation cards, and the current graphics cards are all 3D graphics acceleration cards. It is an interface card that connects the host computer to the display. Its function is to convert the output information of the host computer into characters, graphics, colors, and other information, and transmit it to the display for display.

The graphics card is inserted into the ISA, PCI, AGP expansion slots of the motherboard, and the ISA graphics card is now basically obsolete. There are also some motherboards that have integrated graphics.

The correct way to say it is the video memory of the graphics card, which is mainly used to store the rendering data that the graphics card chip has processed or is about to extract.

Like a computer's memory, video memory is the part that is used to store the graphic information to be processed.

The picture seen on the display is made up of pixels, and each pixel controls its brightness and color with 4 to 32 or even 64 bits of data, which must be saved through the video memory, then handed over to the display chip and CPU for deployment, and finally the calculation result is converted into a graphic output to the display.

Video memory, like motherboard memory, performs the function of storage, but it stores information about each pixel that the graphics card outputs to the display. Video memory is a very important part of the graphics card, after the graphics chip processes the data, it will save the data to the video memory, and then the RAMDAC (digital-to-analog converter) will read the data from the video memory and convert the digital signal to an analog signal, and finally it will be displayed on the screen. In advanced graphics acceleration cards, video memory is not only used to store graphics data, but also is used by the display chip for 3D function operations.

Just like the function of memory, it is a place to store temporary files, which is not much different from a hard disk, except that the speed of reading and writing is thousands of times faster.

In fact, the operation of the graphics card is like a person building a castle or other things with sand, and people must have a sand table when they pile sand, and that sand table is the video memory, and the speed at which people pile sand is the speed of the graphics card core.

1. You only have a small sand table but you want to pile up a super large scene, and in the graphics card, the video memory is small but the scene is large, it will be stuck to death, no matter how good the core of your graphics card is.

2, and the sand table is enough, it depends on the speed of the person to pile the sand, because the scene remains the same, no matter how big the sand table is, it is useless, and the graphics card has enough video memory to depend on the speed of the core.

3, so as long as the graphics card cache is enough, it doesn't need to be too large, and the graphics card core is as fast as possible.

Something that temporarily stores data to be rendered.

Quickly complete all the calculations on the graphics card.