AMD MI50 32GB vs M2 Ultra 128GB for local LLMs
13 reports on the AMD MI50 32GB and 4 on the M2 Ultra 128GB
Which is faster for local LLMs?
On Qwen3-Coder 30B · 3B active at 4-bit, the AMD MI50 32GB has 66.1 generation tokens/s (one run); the M2 Ultra 128GB has 70.3 generation tokens/s (2 runs); prompt processing 1088.7 tokens/s (2 runs). Those are community reports whose engines and settings differ, so the gap is a rough sign, not a controlled measure of the two cards. Memory bandwidth, which caps how fast a card can write, is 25% higher on the AMD MI50 32GB (1,024 GB/s on the AMD MI50 32GB, 819 on the M2 Ultra 128GB).
- Memory
- 32GB
- Memory bandwidth
- 1,024 GB/s
- FP16 compute
- 26.5 TFLOPS
- Reports
- 13
- Memory
- 128GB unified
- Memory bandwidth
- 819 GB/s
- FP16 compute
- 27.2 TFLOPS
- Reports
- 4
Measured on both
Generation and prompt processing speeds from plain runs (one device, one request, no speculative decoding, the whole model in the device's memory) of the same model size at the same bit class. Each side shows the engines and reported context behind its median. Context can mean a configured window or prompt depth, so these are community comparisons with differing settings. How to read these
| Model | AMD MI50 32GB | M2 Ultra 128GB |
|---|---|---|
| Qwen3-Coder 30B · 3B active4-bit | 66.1one runllama.cppcontext not stated | 70.32 runsPP 1088.7 (2 runs)llama.cppcontext not stated |
Estimated by the calculator
The quant the calculator recommends for each card and its estimated speed at a 32,768-token context with 32 GB of system RAM, from memory bandwidth and the model's shape. Where a model was also measured above, the measurement wins.
| Model | AMD MI50 32GB | M2 Ultra 128GB |
|---|---|---|
| Qwen3-Coder 30B · 3B active | 104.7 t/sQ5_K_M | 29.2 t/sFP16 |
| Qwen3.8 27B | 25.7 t/sQ6_K | 8.3 t/sFP16 |
| Qwen3.8 125B · 6B active | 19.6 t/sQ2_K, experts in RAM | 37.9 t/sQ5_K_S |
| Qwen3.6 35B · 3B active | 93.1 t/sQ5_K_M | 26.2 t/sFP16 |
| DeepSeek V4 Flash 284B · 13B active | doesn't fit at these settings | 59.6 t/sQ2_K |
| Qwen3.6 27B | 25.7 t/sQ6_K | 8.3 t/sFP16 |
| Gemma 4 26B · 4B active | 65.4 t/sQ6_K | 22.5 t/sFP16 |
Change the context, RAM or model in the calculator: AMD MI50 32GB · M2 Ultra 128GB
Every report on each card, with its source: AMD MI50 32GB · M2 Ultra 128GB