M3 Pro 18GB vs AMD Strix Halo 128GB for local LLMs
1 report on the M3 Pro 18GB and 320 on the AMD Strix Halo 128GB
Which is faster for local LLMs?
Nobody has reported the same model at the same quant on both cards yet, so there's no measured head-to-head. Memory bandwidth, which caps how fast a card can write, is 1.7x higher on the AMD Strix Halo 128GB (154 GB/s on the M3 Pro 18GB, 256 on the AMD Strix Halo 128GB). The estimates below compare them on the models people run most.
M3 Pro 18GB
- Memory
- 18GB unified
- Memory bandwidth
- 154 GB/s
- FP16 compute
- 7.4 TFLOPS
- Reports
- 1
AMD Strix Halo 128GB
- Memory
- 128GB unified
- Memory bandwidth
- 256 GB/s
- FP16 compute
- 59 TFLOPS
- Reports
- 320
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.
| Model | M3 Pro 18GB | AMD Strix Halo 128GB |
|---|---|---|
| Qwen3.8 27B | doesn't fit at these settings | 3.5 t/sFP16 |
| Qwen3.8 125B · 6B active | doesn't fit at these settings | 12.6 t/sQ6_K |
| Qwen3.6 35B · 3B active | doesn't fit at these settings | 12.6 t/sFP16 |
| DeepSeek V4 Flash 284B · 13B active | doesn't fit at these settings | 33.5 t/sQ2_K |
| Qwen3.6 27B | doesn't fit at these settings | 3.5 t/sFP16 |
| Gemma 4 26B · 4B active | 35.1 t/sQ2_K | 9.5 t/sFP16 |
Change the context, RAM or model in the calculator: M3 Pro 18GB · AMD Strix Halo 128GB
Every report on each card, with its source: M3 Pro 18GB · AMD Strix Halo 128GB