MI300X. Specs, benchmarks, $/hr.
AMD's flagship CDNA 3 accelerator. 192 GB HBM3 at 5.3 TB/s — the same VRAM envelope as a B200 — and 2,615 FP16 TFLOPS, all on ROCm. The price/perf story holds when ROCm holds.
MI300X, specified.
Dense FP16 from the AMD datasheet. Bandwidth is peak; sustained will be lower. Price reflects cheapest verified hourly as of the date stamped at the top.
| Vendor | AMD |
| Tier | Datacenter |
| Generation | CDNA 3 |
| VRAM | 192 GB · HBM3 |
| Memory bandwidth | 5,300 GB/s |
| FP16 dense | 2,615 TFLOPS |
| TDP | 750 W |
| Released | 2023 |
| Price | ~$3–5/hr cloud |
| Status | Available |
Eleven workloads, one card.
Throughput on the same set of repeatable workloads we use across the register. Same quantisation across cards in the same row; latency reported with p95 in the methodology notes.
Numbers without a measurement on this chip are marked "—". Cross-card comparisons live on the head-to-head pages.
| Category | Workload | Metric | MI300X | Notes |
|---|---|---|---|---|
| LLM Inference | Llama 3.1 8B | tok/s | 320 | tokens per second · single-stream · FP16 |
| LLM Inference | Llama 3.1 70B · 4-bit | tok/s | 95 | tokens per second · single-stream · INT4 GPTQ |
| LLM Inference | Qwen 2.5 32B · 4-bit | tok/s | 115 | tokens per second · single-stream · INT4 |
| LLM Inference | Mistral 7B | tok/s | 370 | tokens per second · single-stream · FP16 |
| Image Generation | SDXL 1024×1024 | it/s | 13 | iterations per second · 30 steps · FP16 |
| Image Generation | Flux.1 Dev | it/s | 6.8 | iterations per second · 28 steps · FP16 |
| Training | Fine-tune Llama 3.1 8B LoRA | samples/s | 30 | samples per second · seq 2k · BF16 |
| Training | ResNet-50 · ImageNet | img/s | 6,900 | images per second · BS=256 · BF16 |
| Computer Vision | YOLOv8x · inference | FPS | 680 | frames per second · BS=1 · FP16 |
| Computer Vision | SAM ViT-H | masks/s | 19 | masks per second · 1024×1024 · FP16 |
| Audio/Video | Whisper Large v3 | × RT | 60 | multiples of real-time · CPU offload off |
What fits in 192 GB, really.
FP16 weights = 2 bytes × parameters. INT4 cuts that 4× with small quality loss. Fine-tuning needs 3–4× more memory for gradients, optimiser, activations.
| Model | Params | FP16 | INT8 | INT4 | Fits on MI300X? |
|---|---|---|---|---|---|
| Llama 3.1 8B | 8B | 16 GB | 8 GB | 4 GB | FP16, INT8 and INT4 |
| Qwen 2.5 14B | 14B | 28 GB | 14 GB | 7 GB | FP16, INT8 and INT4 |
| Qwen 2.5 32B | 32B | 64 GB | 32 GB | 16 GB | FP16, INT8 and INT4 |
| Llama 3.1 70B | 70B | 140 GB | 70 GB | 36 GB | FP16, INT8 and INT4 |
| DeepSeek V3 | 671B MoE | 1.3 TB | 671 GB | 336 GB | No |
| Llama 3.1 405B | 405B | 810 GB | 405 GB | 203 GB | No |