Communication of VRAM memory Our graphics card refers to the width of the VRAM memory bus. This bus is usually expressed in the number of bits of data you are able to send and / or receive in a VRAM graph. That is, a 256-bit memory bus that is capable of sending and receiving up to 256 bits of data per clock cycle. Suppose it is compared to the number of roads on the road. The higher the number of roads, the greater the number of vehicles that can travel each hour.
Which width of the memory bus is most commonly used
Different categories of graphics cards use different ones in diameter in his memory box, for reasons we will explain later. In the meantime, it is important to understand the following distinctions:
- 64 and 128 bits: aims for the lowest range of graphics cards.
- 192 and 256: originally intended for middle grade. Now 256 bits are used for high end.
- 352, 384, 512 and 1024 pieces: Top-level set.
- 2048 bits: Only used for graphics with HBM memory.
Both 64 and 128 bits are always used for graphics cards in input range and middle range. In fact, it is still a case of rolling out the graphics card model and GPU type, but with two memory buses available: 128 and 64 layers. Obviously, this means that the model with a small used VRAM bus was cheaper. But also because he worked a little harder than the other.
How is the bandwidth available on the graphics card calculated?
Counting bandwidth graphics card should follow the following mathematical formula:
VRAM x 4 x frequency with memory bus bandwidth / 8 = available bandwidth graphics card
For example: in the case of a graphics card AMD Radeon RX 580, We know that your VRAM GDDDR5 memory frequency is 2,000 MHz. And we know that your VRAM bus is 256 feet wide. This gives us a formula that would look like this:
2000 x 4 x 256/8 = 256 GB / s
What would happen if let's reduce it bandwidth to 192 pieces? Yes, logically, the final value would be reduced.
2000 x 4 x 192/8 = 192 GB / s
By having lower bandwidth, graphics card performance will be reduced respectively. Since GPU I was unable to send or receive data from VRAM card fast enough.
What determines the width of a VRAM bus?
The width of the memory bus is determined by the number of VRAM chips which includes a graph. For example, the NVIDIA GeForce GTX 1060 graphics cards come in two versions: one has 6 GB and the other has 3 GB. Both models had a bus width of 192 bits. However, the 5 GB version came out with a maximum of 160 buses. This is because we are the number of VRAM chips that determine the width of the bus.
In the case of the 6 GB model, NVIDIA opted to use 6 GB of 1 GB capacity. In the case of the 3 GB model, NVIDIA opt to use 512 MB of chip chips. Each of the chips receives a 32-way data path. With the 5 GB model, you can only use 5 chips:
32 x 5 = 160 bits
Therefore the smallest range of data bus of VRAM.
