Difference between DDR & GDDR memory?
From logical terms and research, DDR and GDDR are classified as RAM / System Memory. However, they operate at different voltages, speed and utilize different bandwidth. For example, DDR1 Memory produced 8 bits (virtual data) for every clock – cycle, which in terms, it delivered 8 bits per cycle through the I/O data interface. But, looking at GDDR1 memory, everything is delivered at 16 bits (virtual data) for every clock – cycle. This means, GDDR1 could transfer data at double ratio per clock – cycle.
Secondly, DDR memory can only operate at around 64 / 128 bit. But, GDDR can operate at around 128 bit, 256 bit and 512 bit (across 4-8 channels, maybe more).
Finally, GDDR memory can request and receive data from both directions, where DDR cannot.
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