What is gddr in the video card?

GDDR is the abbreviation for graphics Double Data rate, a kind of video memory, GDDR is designed for high-end graphics design of high-performance DDR memory specifications, which have exclusive operating frequency, clock frequency, voltage, so with the market standard DDR memory is different, is different from normal DDR memory and cannot be shared. In general, it is more suitable to match high-end display chips than ordinary DDR memory clocks used in main memory, which are more expensive and less calorific.

When the application is more and more to carry out 3D display and calculation, frequently read in the video card SDRAM or Sgram save the speed of the continuous picture image data can not meet the demand, people developed gddr, it is in order to replace the old memory of the shortcomings and appear. First-generation GDDR at first was a slightly improved version of normal DDR, but also much faster than older memory.

Into the era of GDDR video memory family A total of five brothers, respectively, Gddr, GDDR2, GDDR3, GDDR4 and GDDR5. GDDR video memory has been eliminated in the market, the current market memory mainly has GDDR2, GDDR3, GDDR4, GDDR5 several types of products.

GDDR2 video memory, currently used by low-end graphics products, using BGA (Ball Grid arraypackage) package, video memory speed from 3.7ns to 2ns, the highest default frequency from 500mhz~1000mhz, but significantly less than GDDR3 memory. Its single particle size is 16bit, the size of the 128bit required 8.

GDDR3 video Memory is a new type of RAM specially developed for graphics processing, the same use of BGA packaging technology, the single particle bit width of 32bit,8 particles can be composed of 256BIT/512MB of the memory bit width and capacity. The video memory speed is between 2.5ns (800MHz) ~0.8ns (2500MHz). Compared with GDDR2,GDDR3 with low power, high frequency and single capacity of the three major advantages, so that GDDR3 is currently widely used for mainstream graphics products.

GDDR4 and GDDR3 Basic technology, GDDR4 single memory particles can achieve 64bit bit width 64MB capacity, that is, only 4 memory chips can realize 256bit bit width and 256MB capacity, 8 can easily achieve 512bit bit width 512MB capacity. At present, the speed of GDDR4 video memory particles is concentrated between 0.7ns~0.9ns, but GDDR4 video memory time series is too long, the same frequency GDDR3 obviously exist on the performance of the use of GDDR4 video memory products, and GDDR4 video memory is not because the voltage is lower and solve the problem of high power consumption, high fever, This led to GDDR4 to the GDDR3 lack of competitiveness, gradually eliminated.

Compared with GDDR3, GDDR4, GDDR5 video memory has many technical advantages, but also has a higher bandwidth, lower power consumption, higher performance. If paired with the same number of video memory particles with a bit of video memory, the total bandwidth provided by GDDR5 video memory particles is more than 3 times times that of GDDR3. Because GDDR5 video memory can be achieved than the current mainstream 128bit or 256bit graphics memory higher than the bit width, it means that the use of GDDR5 memory card will have greater flexibility, performance will have a larger increase. So the current mainstream high-end graphics cards have no exception to the use of GDDR5 video memory.