M4 24GB vs M4 Pro 64GB for local LLMs
8 reports on the M4 24GB and 33 on the M4 Pro 64GB
Which is faster for local LLMs?
On Qwen3.8 27B at 4-bit, the M4 24GB has 6.5 generation tokens/s (one run); prompt processing 60.8 tokens/s (one run); the M4 Pro 64GB has 12.9 generation tokens/s (4 runs); prompt processing 126.2 tokens/s (4 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 2.3x higher on the M4 Pro 64GB (120 GB/s on the M4 24GB, 273 on the M4 Pro 64GB). Across 2 shared models with generation measurements on both cards, the M4 24GB's median is higher on 0 and the M4 Pro 64GB's on 2.
- Memory
- 24GB unified
- Memory bandwidth
- 120 GB/s
- FP16 compute
- 4.3 TFLOPS
- Reports
- 8
- Memory
- 64GB unified
- Memory bandwidth
- 273 GB/s
- FP16 compute
- 9.2 TFLOPS
- Reports
- 33
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 | M4 24GB | M4 Pro 64GB |
|---|---|---|
| Qwen3.8 27B4-bit | 6.5one runPP 60.8 (one run)llama.cppcontext not stated | 12.94 runsPP 126.2 (4 runs)llama.cpp, 2 not statedcontext not stated |
| Gemma 4 12B4-bit | 12.9one runPP 138.5 (one run)llama.cppcontext not stated | 30.02 runsPP 291.5 (2 runs)llama.cpp, 1 not statedcontext 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 | M4 24GB | M4 Pro 64GB |
|---|---|---|
| Qwen3.8 27B | 10.8 t/sQ2_K | 7.7 t/sQ8_0 |
| Gemma 4 12B | 9.4 t/sQ6_K | 8.6 t/sFP16 |
| Qwen3.8 125B · 6B active | doesn't fit at these settings | 34.9 t/sQ2_K |
| Qwen3.6 35B · 3B active | 35.8 t/sQ2_K | 24.1 t/sQ8_0 |
| DeepSeek V4 Flash 284B · 13B active | doesn't fit at these settings | doesn't fit at these settings |
| Qwen3.6 27B | 10.8 t/sQ2_K | 7.7 t/sQ8_0 |
| Gemma 4 26B · 4B active | 24.1 t/sQ3_K_S | 20.7 t/sQ8_0 |
| DeepSeek V4.1 Flash 552B · 16B active | doesn't fit at these settings | doesn't fit at these settings |
Change the context, RAM or model in the calculator: M4 24GB · M4 Pro 64GB
Every report on each card, with its source: M4 24GB · M4 Pro 64GB