M4 Max 64GB vs M5 Max 128GB for local LLMs
18 reports on the M4 Max 64GB and 48 on the M5 Max 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 13% higher on the M5 Max 128GB (546 GB/s on the M4 Max 64GB, 614 on the M5 Max 128GB). The estimates below compare them on the models people run most.
M4 Max 64GB
- Memory
- 64GB unified
- Memory bandwidth
- 546 GB/s
- FP16 compute
- 18.4 TFLOPS
- Reports
- 18
M5 Max 128GB
- Memory
- 128GB unified
- Memory bandwidth
- 614 GB/s
- FP16 compute
- not on record
- Reports
- 48
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 | M4 Max 64GB | M5 Max 128GB |
|---|---|---|
| Qwen3.8 27B | 13.5 t/sQ8_0 | 9.0 t/sFP16 |
| Qwen3.8 125B · 6B active | 61.4 t/sQ2_K | 41.2 t/sQ5_K_S |
| Qwen3.6 35B · 3B active | 42.5 t/sQ8_0 | 28.5 t/sFP16 |
| DeepSeek V4 Flash 284B · 13B active | doesn't fit at these settings | 64.8 t/sQ2_K |
| Qwen3.6 27B | 13.5 t/sQ8_0 | 9.0 t/sFP16 |
| Gemma 4 26B · 4B active | 36.4 t/sQ8_0 | 24.4 t/sFP16 |
Change the context, RAM or model in the calculator: M4 Max 64GB · M5 Max 128GB
Every report on each card, with its source: M4 Max 64GB · M5 Max 128GB