Verified90% confidenceFactExact time
HBM3e single-stack bandwidth can reach 1.2 TB/s, which is 4–9 times the bandwidth of conventional GDDR6.
8
Sources
90%
Confidence
Long-term
Relevance
7/6/2026
First Seen
Sources
GLM-4 Open Source Strikes Back: The AI War Expands to Memory and Space Computing
bilibili智灵Shaw7/3/2026
Related Claims
UnverifiedNVIDIA H100搭载的HBM3提供约3.35TB/s内存带宽，而DDR6预计单通道最高带宽约256GB/s81% similarUnverifiedThe current maximum capacity of a single HBM3e stack is approximately 36 GB, the DDR5 bus width is only 64 bits, whereas HBM can reach 4096 bits.79% similarUnverifiedGPU HBM bandwidth is typically on the order of 2–3 TB/s (3.35 TB/s for H100), while the effective bandwidth of Host DRAM connected via PCIe 5.0 is only about 64 GB/s—a difference of nearly 50x.79% similarUnverifiedOn-chip SRAM access bandwidth can reach hundreds of TB/s, whereas the most advanced HBM3e can only provide approximately 8 TB/s of bandwidth.79% similarUnverifiedA single HBM3E stack can contain 8 to 12 layers of DRAM die, providing over 1 TB/s of bandwidth.78% similar
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