The AMD Instinct MI300X 192GB is AMD's flagship CDNA 3 discrete GPU accelerator, targeting LLM inference and training at scale. With 192 GB of HBM3 memory and 5.3 TB/s of bandwidth, it outspecifies the NVIDIA H100 80GB in raw memory capacity and bandwidth. The 1307 TFLOPS FP16 compute, FP8 support, and full ROCm maturity make it AMD's primary datacenter AI product and the main alternative to NVIDIA in large-scale inference deployments.
Beyond LLMs
AI Capability Matrix
What AI tasks this GPU can handle — from text generation to image and video creation.
CDNA 3 architecture (8 × GCD chiplets, OAM form factor)192 GB HBM3 across 8 stacks5.3 TB/s memory bandwidth304 Compute Units with third-generation Matrix Cores (FP8/BF16/FP16)AMD Infinity Fabric xGMI multi-card interconnectFull ROCm support — AMD's premier AI inference platform
AIワークロード向け
強み
192 GB HBM3 enables inference of 405B FP16 models in a single card
5.3 TB/s bandwidth far exceeds H100 SXM (3.35 TB/s) for decode throughput
FP8 matrix cores enable efficient quantized inference at scale
Mature ROCm support — vLLM, PyTorch ROCm, and SGLang all production-ready
注意点
OAM form factor requires specialized server infrastructure
ROCm software maturity still lags CUDA for cutting-edge research workloads
Training performance typically behind H100 despite similar inference throughput
Very high cost — primarily justified for large-scale production inference
Architecture
CDNA 3
CDNA 3 powers the Instinct MI300X (GPU-only, 192 GB HBM3) and MI300A (APU with integrated CPU). It features advanced packaging with up to 12 chiplets and native FP8 support for AI inference.
AI Relevance
The MI300X with 192 GB HBM3 can hold even the largest open-weight models (70B+ at full precision) entirely in GPU memory. FP8 support and mature ROCm stack make it a serious competitor to NVIDIA H100 for AI inference.
Qwen 3.5 122B A10B matches Chat and keeps a practical fit profile. It is a recent-generation family, which helps on current local SOTA workloads. It fits natively with comfortable headroom. Context coverage stays within the requested workload envelope. Known distribution channels: huggingface, lm-studio.
Devstral 2 123B Instruct is a specialized fit for Coding. It is a recent-generation family, which helps on current local SOTA workloads. It fits natively with comfortable headroom. Context coverage stays within the requested workload envelope. Known distribution channels: huggingface, lm-studio.
Devstral 2 123B Instruct is a specialized fit for Agentic Coding. It is a recent-generation family, which helps on current local SOTA workloads. It fits natively with comfortable headroom. Context coverage stays within the requested workload envelope. Known distribution channels: huggingface, lm-studio.
Devstral 2 123B Instruct matches Reasoning and keeps a practical fit profile. It is a recent-generation family, which helps on current local SOTA workloads. It fits natively with comfortable headroom. Context coverage stays within the requested workload envelope. Known distribution channels: huggingface, lm-studio.
Qwen 3.5 122B A10B matches RAG and keeps a practical fit profile. It is a recent-generation family, which helps on current local SOTA workloads. It fits natively with comfortable headroom. Context coverage stays within the requested workload envelope. Known distribution channels: huggingface, lm-studio.
Image models estimated at 1024×1024 (28 steps, FP16). Video models estimated at 768×512 (25 frames, 30 steps, FP16). Actual performance varies with runtime and system load.
Multi-GPU scaling
AMD Instinct MI300X 192GB — Up to 8× via Infinity Fabric
Scale out with multiple GPUs for larger models. Infinity Fabric provides 896 GB/s inter-GPU bandwidth with 12% overhead.
Config
Effective memory
Models that fit
Est. bandwidth
1× AMD
192 GB
364/380
5,300 GB/s
2× AMD
384 GB
371/380
9,328 GB/s
4× AMD
768 GB
379/380
18,656 GB/s
8× AMD
1536 GB
380/380
37,312 GB/s
Model counts use default quantization at coding workload settings. Multi-GPU scaling factor: 0.88× per additional GPU.
What AI models can I run on AMD Instinct MI300X 192GB?
AMD Instinct MI300X 192GB (192 GB VRAM) can run these top models: DeepSeek V4 Flash (score: 96/100), Qwen 3.5 122B A10B (score: 95/100), Devstral 2 123B Instruct (score: 95/100). See the full compatibility list above.
How much VRAM does AMD Instinct MI300X 192GB have for AI?
AMD Instinct MI300X 192GB has 192 GB of VRAM available for AI model inference. This determines which models and quantization levels you can run locally.
Is AMD Instinct MI300X 192GB good for running LLMs locally?
Yes, AMD Instinct MI300X 192GB is excellent for running LLMs locally with top compatibility scores above 80/100.
What is the best model for AMD Instinct MI300X 192GB for coding?
For coding on AMD Instinct MI300X 192GB, we recommend Devstral 2 123B Instruct. It achieves 46.8 tokens per second with 212K context window. Devstral 2 123B Instruct is a specialized fit for Coding. It is a recent-generation family, which helps on current local SOTA workloads. It fits natively with comfortable headroom. Context coverage stays within the requested workload envelope. Known distribution channels: huggingface, lm-studio.
Should I upgrade from AMD Instinct MI300X 192GB?
There are 3 upgrade path(s) from AMD Instinct MI300X 192GB: AMD Instinct MI300X 192GB, AMD Instinct MI325X 256GB. Upgrading would unlock larger models and faster inference speeds.
Can AMD Instinct MI300X 192GB run Flux for image generation?
Yes, AMD Instinct MI300X 192GB with 192 GB of usable memory can run Flux.1 Dev at FP16 natively. Flux is a 12B parameter diffusion transformer that produces high-quality images. You can also run the Schnell variant for faster generation.
What image and video AI models can I run on AMD Instinct MI300X 192GB?
AMD Instinct MI300X 192GB (192 GB VRAM) can handle various AI generation tasks beyond LLMs. For image generation, SDXL and Stable Diffusion 3.5 run well. Flux.1 Dev also runs natively for state-of-the-art image quality. For video, LTX Video 2.3 can generate short clips. Check the AI Capability Matrix above for detailed compatibility.
Is AMD Instinct MI300X 192GB good for AI image generation?
AMD Instinct MI300X 192GB is excellent for AI image generation. With 192 GB of usable memory, it runs all major diffusion models including Flux.1, SDXL, and Stable Diffusion 3.5 at full precision. You can generate high-resolution images quickly and even handle video generation models.
Can AMD Instinct MI300X 192GB run Qwen 3.5 27B?
Yes, AMD Instinct MI300X 192GB with 192 GB of usable memory can run Qwen 3.5 27B at Q8 (near-lossless, ~28.9 GB) or even FP16 (~55.4 GB) depending on your context needs. This setup provides an excellent experience with this model. Use Ollama or vLLM for best results.
What is the best quantization for AI models on AMD Instinct MI300X 192GB?
With 192 GB VRAM on AMD Instinct MI300X 192GB, use Q8_0 for most models — it is near-lossless and you have the memory for it. For 70B+ models, Q6_K offers excellent quality. Reserve Q4_K_M for 100B+ models or when you need maximum context length.
For local LLMs on AMD Instinct MI300X 192GB, does VRAM matter more than bandwidth?
AMD Instinct MI300X 192GB already has strong memory bandwidth, so the next limit is often memory capacity and context headroom rather than raw decode speed. For local LLMs, fit first and bandwidth second is the right mental model.
How does multi-GPU scale for AI inference on AMD Instinct MI300X 192GB?
AMD Instinct MI300X 192GB supports up to 8× GPU scaling via Infinity Fabric at 896 GB/s. With 8× GPUs, you get 1536 GB effective memory with a 0.88× scaling factor per GPU. This enables running models like Qwen 3.5 397B A17B and Kimi K2.5 that don't fit on a single card.
Is Infinity Fabric required for multi-GPU AMD Instinct MI300X 192GB inference?
Infinity Fabric is recommended for AMD Instinct MI300X 192GB multi-GPU inference, providing 896 GB/s interconnect bandwidth with only 12% scaling overhead. PCIe-only setups work but have higher overhead (~25%) due to limited inter-GPU bandwidth.