Side-by-side GPU comparison: specs, memory, compute performance, and live cloud pricing.
Verdict
MI300X has 48 GB more VRAM, making it better suited for large models and long context windows. For compute-bound workloads like training, MI300X delivers 48.1× higher FP16 throughput. MI300X supports a broader range of models (659 vs 657 from this catalog), giving more flexibility.
Specifications
| M3 Ultra (192 GB) | MI300X | |
|---|---|---|
| VRAM | 144 GB | 192 GB |
| VRAM Type | LPDDR5 | HBM3 |
| Memory Bandwidth | 0.8 TB/s | 5.3 TB/s |
| FP16 Performance | 27 TFLOPS | 1307 TFLOPS |
| Manufacturer | Apple | AMD |
| FP8 Support | No | Yes |
| FP4 Support | No | No |
Price / Performance
Based on cheapest single-GPU on-demand pricing. Lower $/TFLOP = better compute value; lower $/GB = better memory value.
| M3 Ultra (192 GB) | MI300X | |
|---|---|---|
| $/hr (cheapest) | — | $1.99 |
| $/TFLOP (compute value) | — | $0.0015 |
| $/GB VRAM (memory value) | — | $0.0104 |
Cloud Pricing
Cheapest on-demand price per provider (single GPU).
Model Compatibility
Models from the catalog that fit on each GPU, grouped by required precision.
M3 Ultra (192 GB) (657 models)
MI300X (659 models)
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Pricing data refreshed hourly · Last updated April 11, 2026 · Browse all comparisons