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MI300X vs MI325XSpecs, memory and LLM performance
The MI325X keeps the MI300X’s compute but raises memory to 256 GB of HBM3e (from 192 GB of HBM3) and bandwidth to 6 TB/s (from 5.3 TB/s), at 1,000 W instead of 750 W.
Memory
192 GB vs 256 GB
Bandwidth
5.3 TB/s vs 6 TB/s
Power
750 W vs 1,000 W
Type
Data center GPU vs Data center GPU
Which should you choose?
CHOOSE MI300X IF
Your models fit in 192 GB per GPU and you want lower power.
CHOOSE MI325X IF
You need more memory per GPU for larger models or longer contexts.
Still deciding between MI300X and MI325X?
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MI300X vs MI325X specs
Manufacturer specifications. Green marks the stronger figure where a higher number is better. Dense compute is shown without sparsity.
| Specification | AMD Instinct MI300X | AMD Instinct MI325X |
|---|---|---|
| Type | Data center GPU | Data center GPU |
| Memory | 192 GB | 256 GB |
| Memory type | HBM3 | HBM3e |
| Memory bandwidth | 5.3 TB/s | 6 TB/s |
| FP16 / BF16 (dense) | 1,307 TFLOPS | 1,307 TFLOPS |
| FP8 (dense) | 2,615 TFLOPS | 2,615 TFLOPS |
| FP4 (dense) | Not supported | Not supported |
| Power | 750 W | 1,000 W |
| Multi-GPU link | Infinity Fabric: 896 GB/s | Infinity Fabric: 896 GB/s |
| Form factor | OAM module in 8-GPU servers | OAM module in 8-GPU servers |
| Architecture | CDNA 3, 2023 | CDNA 3, 2024 |
| Software | ROCm, vLLM, SGLang | ROCm, vLLM, SGLang |
| Price | No list price: sold in servers through OEMs and cloud providers | No list price: sold in servers through OEMs and cloud providers |
What they mean for running LLMs
For large language models, memory decides which models fit and how many users you can serve, and memory bandwidth decides how fast each user gets tokens. These are planning figures for one GPU or system using a 4-bit model.
| For LLMs | MI300X | MI325X |
|---|---|---|
| Usable for models | About 173 GB | About 230 GB |
| Largest dense model at 4-bit (1 user, short context) | About 280B parameters | About 370B parameters |
| Llama 3.3 70B at 4-bit, single-user speed ceiling | About 136 tokens/s | About 155 tokens/s |
Which open-weight models fit
Memory needed for one user with 8K context at the lowest precision available for each model. Open a model for team-size and fine-tuning figures.
| Model (1 user, 8K context, lowest available precision) | MI300X | MI325X |
|---|---|---|
| gpt-oss-20b 21B · about 15 GB at MXFP4 | Yes | Yes |
| Gemma 4 26B A4B 25.2B · about 16 GB at 4-bit | Yes | Yes |
| Qwen3.6-27B 27.78B · about 20 GB at 4-bit | Yes | Yes |
| Qwen3.8-27B 27.8B · about 24 GB at NVFP4 | Yes | Yes |
| Gemma 4 31B 30.7B · about 20 GB at 4-bit | Yes | Yes |
| Qwen3.6-35B-A3B 35B · about 24 GB at NVFP4 | Yes | Yes |
| Llama 3.3 70B Instruct 70.6B · about 46 GB at INT4 | Yes | Yes |
| gpt-oss-120b 117B · about 70 GB at MXFP4 | Yes | Yes |
| MiniMax-M2.5 229B · about 135 GB at 4-bit | Yes | Yes |
| GLM-5.3-Flash 320B · about 192 GB at NVFP4 | 2 GPUs | Yes |
| DeepSeek-V4.1-Flash 552B · about 320 GB at 4-bit | 2 GPUs | 2 GPUs |
| DeepSeek-R1 671B · about 410 GB at 4-bit | 4 GPUs | 2 GPUs |
| DeepSeek-V3.2 685B · about 419 GB at NVFP4 | 4 GPUs | 2 GPUs |
| GLM-5.2 744B · about 455 GB at NVFP4 | 4 GPUs | 2 GPUs |
| GLM-5.3 753B · about 460 GB at NVFP4 | 4 GPUs | 2 GPUs |
| GLM-5.1 754B · about 461 GB at NVFP4 | 4 GPUs | 4 GPUs |
| Kimi K2 1T · about 579 GB at 4-bit | 4 GPUs | 4 GPUs |
| DeepSeek-V4-Pro 1.6T · about 976 GB at FP4 + FP8 | 8 GPUs | 8 GPUs |
| Kimi K3 2.8T · about 1.62 TB at MXFP4 | No: more than 8 GPUs | 8 GPUs |
Models in amber need several of these GPUs working as one. Buying the GPUs is the easy part. Vanik Edge OS splits the model across them, keeps it running if a server fails and manages it all from one console. See how Edge OS clusters GPU servers
FROM SIZING TO RUNNING
Sizing the hardware is the easy part.
Getting several GPUs to work as one system for a whole company is where most projects slow down. That is the part Vanik Edge OS does for you.
STEP 01 · THIS TOOL
Size it
Work out the GPU memory your models need and which GPUs or servers can hold them.
STEP 02 · VANIK EDGE OS
Cluster it
Edge OS joins your GPU servers into one cluster, splits a large model across them and keeps it running if a server fails. NVIDIA and AMD servers work side by side.
STEP 03 · VANIK EDGE OS
Run it
Your team gets AI apps with single sign-on and an audit trail, managed from one console, with your data staying inside your building.
MI300X vs MI325X questions
What is the difference between the MI300X and the MI325X?
The MI325X keeps the MI300X’s compute but raises memory to 256 GB of HBM3e (from 192 GB of HBM3) and bandwidth to 6 TB/s (from 5.3 TB/s), at 1,000 W instead of 750 W.
MI300X vs MI325X: which is better for LLM inference?
For generating tokens, the MI325X is faster: it has 6 TB/s of memory bandwidth versus 5.3 TB/s, and LLM token generation is mostly limited by bandwidth. The MI325X holds larger models and more users’ context with 256 GB of memory versus 192 GB. Choose the MI300X if your models fit in 192 GB per GPU and you want lower power. Choose the MI325X if you need more memory per GPU for larger models or longer contexts.
Can the MI300X and MI325X run Llama 3.3 70B?
Llama 3.3 70B needs about 46 GB of memory at 4-bit for one user with 8K context. The MI300X runs it on one GPU at about 136 tokens/s at most for one user, and the MI325X runs it on one GPU at about 155 tokens/s at most for one user. Speeds are theoretical ceilings from memory bandwidth; real speeds are usually 50 to 80% of that.
How much does the MI300X cost compared with the MI325X?
MI300X: No list price: sold in servers through OEMs and cloud providers. MI325X: No list price: sold in servers through OEMs and cloud providers. Data center GPUs are usually bought as part of 4- or 8-GPU servers, so compare full-system quotes.
How are these numbers calculated?
Memory, bandwidth, compute and power are manufacturer specifications. Model memory needs come from our VRAM calculator: weights plus KV cache plus about 5 to 10% runtime overhead, keeping 10% of each GPU free (15% on GB10 systems, 25% on Mac). The speed ceiling is memory bandwidth divided by the model’s weight size. All figures are planning estimates.
Related comparisons
Specifications from the manufacturer pages for the AMD Instinct MI300X and AMD Instinct MI325X. Speed ceilings are bandwidth divided by model size, before batching; real throughput depends on the inference engine and settings. Last checked November 10, 2026.
Not sure which hardware fits your team?
Vanik Edge OS runs open-weight models on NVIDIA DGX, AMD Instinct and other GPU servers on your premises, and helps you size the hardware first.