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Memory

GPU memory determines what fits on a single device and how fast data can move through the compute units. VRAM capacity sets the upper limit on model size and KV cache; VRAM bandwidth determines how quickly the decode phase can load weights per token. Modern datacenter GPUs use high-bandwidth memory (HBM) in generations HBM3, HBM3e, and HBM4, stacked directly on the GPU die to maximize bandwidth.

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