MI355X vs MI325X
Spec-sheet and pricing comparison of AMD Instinct MI355X and AMD Instinct MI325X with links to continuously measured LLM inference benchmarks on identical workloads.
Spec-sheet comparison
| MI355X | MI325X | MI355X / MI325X | |
|---|---|---|---|
| Memory per chip | 288 GB HBM3e | 256 GB HBM3e | 1.13x |
| Memory bandwidth | 8 TB/s | 6 TB/s | 1.33x |
| Dense FP8 compute | 5,033 TFLOP/s | 2,615 TFLOP/s | 1.92x |
| Dense FP4 compute | 10,066 TFLOP/s | Not supported | n/a |
| TDP | 1,400 W | 1,000 W | 1.4x |
| Hourly rate (neocloud tier) | $2.09/hr | $1.32/hr | 1.58x |
| Scale-up world size | 8 chips | 8 chips | 1.0x |
Ratios are spec-sheet values; see the live compare pages for measured deltas.
Frequently asked questions
- Which has more memory, MI355X or MI325X?
- MI355X offers 288 GB HBM3e per chip versus 256 GB HBM3e on MI325X (1.13x the capacity).
- How do MI355X and MI325X prices compare?
- At the neocloud tier the SemiAnalysis TCO model rates MI355X at $2.09/hr versus $1.32/hr for MI325X. Hourly price alone is misleading; the per-dollar compare pages divide measured throughput by these rates.
- Is MI355X faster than MI325X for LLM inference?
- On paper MI355X has 1.92x the dense FP8 compute of MI325X, but delivered tokens per second depend on the model, framework, precision and interactivity target. InferenceX measures both chips daily on identical workloads; see the live compare pages for current results.
See live benchmark results
Every number above is static hardware data. Delivered tokens per second, cost per million tokens and energy per token are measured continuously on the dashboard:
Go deeper with the SemiAnalysis models
InferenceX measures delivered inference performance. The SemiAnalysis institutional models cover the market behind these chips: who ships them, who buys them, and what they cost to own.
SemiAnalysis Accelerator & HBM Model
SKU-level AI accelerator shipments, pricing and specifications, from foundry wafer starts and HBM supply through customer-level installed base, quarterly with multi-year forecasts.
SemiAnalysis AI Cloud TCO Model
The source of the hourly rates on this page: all-in GPU cost of ownership built up from server capex, power, colocation and cost of capital, with rental price scenarios and a full cluster finance suite.