Radeon PRO W6400 vs Radeon PRO W6600
With 8GB on board versus 4GB for the Radeon PRO W6400, the Radeon PRO W6600 carries more headroom for large models and memory-hungry workloads. Its memory bandwidth is 75% higher (224 GB/s vs 128 GB/s), translating directly to faster inference throughput. Price-wise, the Radeon PRO W6400 undercuts the Radeon PRO W6600 by $165 USD.
Maximum Capacity Reached. Remove a model to add another. (2/2)
Comparable or lower specs
Radeon PRO W6400 vs Radeon PRO W6600: In-Depth Breakdown
VRAM: Radeon PRO W6400 vs Radeon PRO W6600
With 8GB of VRAM against the Radeon PRO W6400's 4GB, the Radeon PRO W6600 has a 4GB edge. VRAM is what determines whether a model fits without quantization at all — a 70B-parameter model in FP16 needs around 140GB, and smaller models still benefit from spare capacity. That extra headroom lets the Radeon PRO W6600 load bigger models and run larger production batch sizes.
Inference Speed: Memory Bandwidth
Memory bandwidth determines how quickly data is fed to the compute units — it's the main bottleneck for autoregressive inference (token generation in LLMs). The Radeon PRO W6600 delivers 224 GB/s versus 128 GB/s on the Radeon PRO W6400, a 75% edge. For models already loaded into VRAM, token generation speed scales closely with this number: the Radeon PRO W6600 will produce tokens proportionally faster in bandwidth-bound workloads.
AI Training & Compute
FP32 throughput is the metric that matters most for training, scientific simulation, and rendering work. The Radeon PRO W6600 posts 10.4 TFLOPS versus 3.6 TFLOPS on the Radeon PRO W6400, a 189% compute lead. Expect training jobs and heavy matrix math to finish proportionally sooner on the Radeon PRO W6600.
Price & Value
The Radeon PRO W6400 lists from $232 USD, $165 USD less than the Radeon PRO W6600 at $397 USD. For budget-constrained teams, the savings may outweigh the spec gap — especially if the smaller card covers your typical workload.
Which should you buy: Radeon PRO W6400 or Radeon PRO W6600?
Go with the Radeon PRO W6600 if you need maximum capacity: it's ahead on VRAM, bandwidth, and compute, so it's the stronger fit for large models and training jobs. The Radeon PRO W6400 is the cheaper pick ($165 USD less) — worth it if your models already fit within its 4GB and you're not running heavy inference volume.
Frequently Asked Questions
Can the Radeon PRO W6400 or Radeon PRO W6600 run large language models?
Which is faster for LLM inference, the Radeon PRO W6400 or the Radeon PRO W6600?
Which is better for AI training?
Which should you buy: Radeon PRO W6400 or Radeon PRO W6600?
Technical Specifications Comparison
Architecture & Cores
| Specification | Radeon PRO W6400 | Radeon PRO W6600 |
|---|---|---|
| Architecture | RDNA 2 | RDNA 2 |
| CUDA Cores (Stream Processors / Stream Processors) | 768 | 2,048✓ |
Memory
| Specification | Radeon PRO W6400 | Radeon PRO W6600 |
|---|---|---|
| VRAM Capacity | 4 GB | 8 GB✓ |
| Memory Type | GDDR6 | GDDR6 |
| Memory Bus | 64-bit | 128-bit✓ |
| Bandwidth | 128 GB/s | 224 GB/s✓ |
Connectivity & Power
| Specification | Radeon PRO W6400 | Radeon PRO W6600 |
|---|---|---|
| Interface | PCIe 4.0 x4 | PCIe 4.0 x8 |
| TDP | 50 W✓ | 100 W |
| Released | Mar 2022 | Jun 2021 |
Workstation
| Specification | Radeon PRO W6400 | Radeon PRO W6600 |
|---|---|---|
| FP32 (TFLOPS) | 3.6 TFLOPS | 10.4 TFLOPS✓ |
| ECC | Yes | Yes |
| NVLink | No | No |
| Form factor | low-profile | dual-slot |