DDR DIMM Memory Modules


Graphics Double Data Rate

GDDR Description

Graphics Double Data Rate DIMM [GDDR-DIMM, or GDDR DIMM] is similar to the JEDEC standard for Double Date Rate SDRAMs. This page covers the GDDR memory chips, which are only found on high-end Video cards used in desktop PCs. Refer to the general Memory Module page for a more complete listing of different types of modules, manufactures and descriptions. GDDR1 uses 2.5 volt signalling, GDDR2 uses 1.8 volt signalling.
GDDR 3 runs at up to 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 which is just now starting to show up provides a bandwidth of 18GHz. GDDR5 operates at up to 5Gbps at 1.5 volts, [GDDR5 Pin out].

GDDR DIMM Memory Road Map from Qimonda
GDDR Road Map

GDDR Electrical Interface

GDDR1 uses 2.5 volt signalling, GDDR2 uses 1.8 volt signalling, GDDR3 uses 1.5 volt signalling.

GDDR IC Manufacturers

GDDR memory chips are found in desk tops, and work-stations.
Some companies have discontinued GDDR1 support. Example IC package types:

Hynix {256Mb/512Mb GDDR, GDDR3, 512Mb GDDR4 SDRAM ICs}

Rambus {GDDR Controller, GDDR1, GDDR2, GDDR3 Controllers}

Samsung Semiconductor Inc.
{GDDR1, GDDR2, GDDR3 ICs and GDDR4 memory}

DIMM Sockets;
DIMM/SIMM Socket Manufacturers.

Navigation: Engineering Home > OEM Equipment Vendors > Computer Gear > Memory Modules > GDDR DIMM Sticks.

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Modified 2/13/12
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