Citation :
GDDR3 evolves from DDR2, but still has some pretty important differences. Firstly, GDDR3 makes use of a single-ended, unidirectional strobe that separates the reads and writes. DDR2, by contrast, uses differential bi-directional strobes. Secondly, GDDR3 utilises a pseudo-open drain interface technique that is based on voltage rather than current. This was done so that graphics chips can be compatible with DDR, DDR2 and GDDR3. Like DDR2, GDDR3 interface uses 1.8-Volt SSTL. Such memory is better suited to point-to-point links used on graphics cards and allows GPU developers to reach the new performance and feature heights with their products.
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