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Pyyan / Compare / H100 vs B300 Blackwell Ultra vs MI400

H100 vs B300 Blackwell Ultra vs MI400

3 of 5

GPU & AI Chips · verified 13 Aug 2026

×H100NVIDIAcurrent
×B300 Blackwell UltraNVIDIAcurrent
×MI400AMDcurrent
2 slots left
SpecificationH100B300 Blackwell UltraMI400
SummaryThe workhorse of the previous generation.15 PFLOPS dense FP4.Double NVIDIA's memory capacity.
Memory80GB HBM3288GB HBM3e432GB HBM4
Bandwidth—8 TB/s19.6 TB/s
Price$25–40K~$40–50K (verify)—
VendorNVIDIANVIDIAAMD
CategoryGPU & AI ChipsGPU & AI ChipsGPU & AI Chips
OfficialNVIDIA ↗NVIDIA ↗AMD ↗

Highlighted rows are where these differ.

H100

The workhorse of the previous generation.

Best for value.

Full spec sheet →

B300 Blackwell Ultra

  • 8 TB/s memory bandwidth
  • Per-GPU pricing widely misquoted — one source cites rack pricing

Best for frontier training.

Full spec sheet →

MI400

  • 19.6 TB/s bandwidth
  • 40 PFLOPS FP4
  • $7.2B in commitments

Best for large-model inference.

Full spec sheet →