GDDR or Graphic Double Data Rate

Double data rate

In computing, a computer bus operating with double data rate transfers data on both the rising and falling edges of the clock signal. This is also known as double pumped, dual-pumped, and double transition....

memory refers to memory specifically designed for use on graphics cards. GDDR is distinct from the more widely known DDR SDRAM types

SDRAM

Synchronous dynamic random access memory is dynamic random access memory that is synchronized with the system bus. Classic DRAM has an asynchronous interface, which means that it responds as quickly as possible to changes in control inputs...

 such as DDR3

DDR3 SDRAM

In computing, DDR3 SDRAM, an abbreviation for double data rate type three synchronous dynamic random access memory, is a modern kind of dynamic random access memory with a high bandwidth interface. It is one of several variants of DRAM and associated interface techniques used since the early 1970s...

, although they share some technologies - including double data rate design - in common. Currently, the following generations of GDDR exist, with the higher number indicating the more recent specifications:

• GDDR2
• GDDR3
  GDDR3
  Graphics Double Data Rate 3 is a graphics card-specific memory technology, designed by ATI Technologies with the collaboration of JEDEC.It has much the same technological base as DDR2, but the power and heat dispersal requirements have been reduced somewhat, allowing for higher performance memory...
  
  
• GDDR4
  GDDR4
  GDDR4 SDRAM is a type of graphics card memory specified by the JEDEC Semiconductor Memory Standard. It is a rival medium to Rambus's XDR DRAM...
  
  
• GDDR5
  GDDR5
  GDDR5 SDRAM is a type of high performance DRAM graphics card memory designed for computer applications requiring high bandwidth...
  
  

See also

• Double data rate
  Double data rate
  In computing, a computer bus operating with double data rate transfers data on both the rising and falling edges of the clock signal. This is also known as double pumped, dual-pumped, and double transition....
  
  
• SDRAM
  SDRAM
  Synchronous dynamic random access memory is dynamic random access memory that is synchronized with the system bus. Classic DRAM has an asynchronous interface, which means that it responds as quickly as possible to changes in control inputs...
  
  
• DDR SDRAM
  DDR SDRAM
  Double data rate synchronous dynamic random access memory is a class of memory integrated circuits used in computers. DDR SDRAM has been superseded by DDR2 SDRAM and DDR3 SDRAM, neither of which are either forward or backward compatible with DDR SDRAM, meaning that DDR2 or DDR3 memory modules...
  
  
• DDR2 SDRAM
  DDR2 SDRAM
  DDR2 SDRAM is a double data rate synchronous dynamic random-access memory interface. It supersedes the original DDR SDRAM specification and has itself been superseded by DDR3 SDRAM...
  
  
• DDR3 SDRAM
  DDR3 SDRAM
  In computing, DDR3 SDRAM, an abbreviation for double data rate type three synchronous dynamic random access memory, is a modern kind of dynamic random access memory with a high bandwidth interface. It is one of several variants of DRAM and associated interface techniques used since the early 1970s...
  
  
• DDR4 SDRAM
  DDR4 SDRAM
  In computing, DDR4 SDRAM, an abbreviation for double data rate type four synchronous dynamic random-access memory, is a type of dynamic random-access memory with a high bandwidth interface currently under development and expected market release in 2012. As a "next generation" successor to DDR3...