Intel Arc Pro B70 vs M1 Ultra 128GB for local LLMs
17 reports on the Intel Arc Pro B70 and 3 on the M1 Ultra 128GB
Which is faster for local LLMs?
On Qwen3.8 27B at 4-bit, the Intel Arc Pro B70 runs at 25.6 tokens per second (one run) and the M1 Ultra 128GB at 25.1 (one run). 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 35% higher on the M1 Ultra 128GB (608 GB/s on the Intel Arc Pro B70, 819 on the M1 Ultra 128GB).
- Memory
- 32GB
- Memory bandwidth
- 608 GB/s
- FP16 compute
- 183.5 TFLOPS
- Reports
- 17
- Memory
- 128GB unified
- Memory bandwidth
- 819 GB/s
- FP16 compute
- 21 TFLOPS
- Reports
- 3
Measured on both
Median tokens per second 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 quant level. Engines and context lengths can still differ between the runs. How to read these
| Model | Intel Arc Pro B70 | M1 Ultra 128GB |
|---|---|---|
| Qwen3.8 27B4-bit | 25.6one run | 25.1one run |
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 | Intel Arc Pro B70 | M1 Ultra 128GB |
|---|---|---|
| Qwen3.8 27B | 15.2 t/sQ6_K | 7.5 t/sFP16 |
| Qwen3.8 125B · 6B active | 18.6 t/sQ2_K, experts in RAM | 34.0 t/sQ5_K_S |
| DeepSeek V4 Flash 284B · 13B active | doesn't fit at these settings | 53.5 t/sQ2_K |
| Qwen3.6 35B · 3B active | 55.3 t/sQ5_K_M | 23.5 t/sFP16 |
| Qwen3.6 27B | 15.2 t/sQ6_K | 7.5 t/sFP16 |
| GLM-5.3 320B · 18B active | doesn't fit at these settings | doesn't fit at these settings |
| Gemma 4 26B · 4B active | 38.8 t/sQ6_K | 20.2 t/sFP16 |
Change the context, RAM or model in the calculator: Intel Arc Pro B70 · M1 Ultra 128GB
Every report on each card, with its source: Intel Arc Pro B70 · M1 Ultra 128GB