system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is Video RAM (Like GDDR5) so much faster than regular RAM (Like DDR3 or DDR4)?
gpt
GDDR, similar to GPUs are very parallel in design.

So while you might have "dual channel" or "triple channel" memory slots on a system board, GDDR memory can be arranged into 8, 16, or 32 parallel channels on the graphics circuit board. This yields nearly linear performance gains in memory throughput since memory chips are accessed in parallel.  For this to work efficiently, this requires that the graphics chip itself is also designed to be massively parallel (unlike CPUs) with hundreds (or thousands) of cores / shader processing units that are all loaded up between ticks and all fired simultaneously on the clock tick.