GDDR Memory Definition
Version: 18.2
Revision: 24
GDDR Memory – Hardware
GDDR stands for: “Graphics Double Data Rate.” Although, DIMM is similar to the JEDEC standard for “Double Date Rate – SDRAMs”.
This will only cover GDDR memory modules, which is only found on ‘high-end’ Video cards – used in desktop PCs, VGA Mobility Notebooks and Game Consoles.
GDDR is an evolving family of DDR – SDRAM chips, which is only designed (solely) to handle enormous demands of graphics processing power. Nevertheless, there are three standards, which still exist: GDDR-I, GDDR-II [backed by Nvidia Corporation], and GDDR-III [backed by ATI Corporation]. The standards are different from their clock speed, bandwidth and power-management capabilities with other attributes. Most graphics card vendors [including ATI and Nvidia] are planning their bets for the best compatibility, with whichever standard is appropriate.
GDDR memory history
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GDDR1 uses 2.5 volt signaling, GDDR2 uses 1.8 volt signaling.
GDDR3 runs at around 1.5 times the speed of GDDR 2! But, consumes half the power….
DDR3 SDRAM devices offer data transfer rates up to 1600 Mbps. Module densities range from 256MByte up to 8GByte for standard JEDEC modules.
GDDR1 Bandwidth: up to 1.2Gbytes/s with a 300MHz clock, GDDR2 Bandwidth: up to 2.0Gbytes/s with a 500MHz clock, GDDR3 Bandwidth: up to 9.6 Gbytes/s with a 1GHz clock.
GDDR4 provides a bandwidth of 1.8GHz. But, is uses alot of power and heat!!
Warning: GDI is called; “Graphics Device Interface.” They are not VGA cards!
They are only Windows’ standard for drawing all the graphical objects, including common – fundamentals objects.
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Knowledge point.
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Graphics accelerator is a circuit board or a card, that enables a computer to display graphics on a monitor. Most computers have a graphics accelerator that contains its own processor, in order to speed up the processing, to display complex images.
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