HBM (High Bandwidth Memory)
GDDR · Memory chips around the GPU
First look at GDDR memory, with DRAM chips placed around the GPU on the circuit board.
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HBM · Vertically stacked DRAM
HBM stacks DRAM dies vertically and places the stack close to the GPU.
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Principles and uses
Compare the stacked DRAM and interconnect arrangement of HBM with GDDR.
Stack DRAM near the GPU and connect it through a wide bus.
TSVs connect stacked dies, while an interposer connects HBM to the GPU. Bus widths vary by generation; the diagram uses example values.
Use it to understand GPU memory bandwidth, data-transfer costs, and memory packaging.