Citrini Analyst Questions SanDisk’s HBF Performance Comparison: Demonstrated Parameters May Underestimate HBM’s Actual Capabilities.
58 minutes ago
Citrini analyst Zephyr published a report questioning that the performance comparison between HBF and HBM presented by SanDisk at its Investor Day had parameter setting biases, arguing the company "deliberately underestimated HBM's performance" in the demonstration. He noted that SanDisk set the total bandwidth of both HBM and HBF at 12.8TB/s in the comparison, equivalent to 1.6TB/s per stack, while running the Qwen3-480B-A35B model with bfloat16 precision. Zephyr stated that current model inference mostly uses FP4 or FP8, so the required capacity for this model across different quantization methods ranges from approximately 240GB to 480GB. Zephyr added that SanDisk fixed HBM's per-GPU capacity at 192GB, but a 16-layer HBM4E configured with 8 stacks can reach 512GB capacity and deliver around 32TB/s bandwidth, roughly three times the parameter values SanDisk used in its demonstration. He argued that these parameter choices make SanDisk's demonstration result — claiming "HBF only requires 1 to 4 GPUs, while HBM needs 8 GPUs" — fail to fully represent the actual performance of higher-spec HBM configurations.
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