M3 Ultra 96GB vs NVIDIA RTX 3090 for local LLMs
10 reports on the M3 Ultra 96GB and 219 on the NVIDIA RTX 3090
Which is faster for local LLMs?
On Qwen3.5 35B · 3B active at 4-bit, the M3 Ultra 96GB has 109.7 generation tokens/s (one run); prompt processing 1770.1 tokens/s (one run); the NVIDIA RTX 3090 has generation speed not reported; prompt processing 980.0 tokens/s (one run). Memory bandwidth, which caps how fast a card can write, is 14% higher on the NVIDIA RTX 3090 (819 GB/s on the M3 Ultra 96GB, 936 on the NVIDIA RTX 3090).
- Memory
- 96GB unified
- Memory bandwidth
- 819 GB/s
- FP16 compute
- 21.3 TFLOPS
- Reports
- 10
- Memory
- 24GB
- Memory bandwidth
- 936 GB/s
- FP16 compute
- 142 TFLOPS
- Reports
- 219
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 | M3 Ultra 96GB | NVIDIA RTX 3090 |
|---|---|---|
| Qwen3.5 35B · 3B active4-bit | 109.7one runPP 1770.1 (one run)MLXcontext not stated | -0 runsPP 980.0 (one run)llama.cpp64K context |
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 | M3 Ultra 96GB | NVIDIA RTX 3090 |
|---|---|---|
| Qwen3.5 35B · 3B active | 57.1 t/sQ8_0 | 120.1 t/sQ4_K_S |
| Qwen3.8 27B | 7.9 t/sFP16 | 33.9 t/sQ4_K_M |
| Qwen3.8 125B · 6B active | 55.1 t/sQ3_K_M | 19.4 t/sQ2_K, experts in RAM |
| Qwen3.6 35B · 3B active | 57.1 t/sQ8_0 | 120.1 t/sQ4_K_S |
| DeepSeek V4 Flash 284B · 13B active | doesn't fit at these settings | doesn't fit at these settings |
| Qwen3.6 27B | 7.9 t/sFP16 | 33.9 t/sQ4_K_M |
| Gemma 4 26B · 4B active | 19.0 t/sFP16 | 76.4 t/sQ5_K_S |
Change the context, RAM or model in the calculator: M3 Ultra 96GB · NVIDIA RTX 3090
Every report on each card, with its source: M3 Ultra 96GB · NVIDIA RTX 3090