M3 Ultra 512GB vs AMD Radeon 890M for local LLMs
41 reports on the M3 Ultra 512GB and 2 on the AMD Radeon 890M
Which is faster for local LLMs?
On Qwen3.5 35B · 3B active at 4-bit, the M3 Ultra 512GB has 80.9 generation tokens/s (one run); prompt processing 2779.0 tokens/s (one run); the AMD Radeon 890M has 14.9 generation tokens/s (one run); prompt processing 212.1 tokens/s (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
- 512GB unified
- Memory bandwidth
- 819 GB/s
- FP16 compute
- 28.4 TFLOPS
- Reports
- 41
- Memory
- shared memory unified
- Memory bandwidth
- not on record
- FP16 compute
- not on record
- Reports
- 2
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 512GB | AMD Radeon 890M |
|---|---|---|
| Qwen3.5 35B · 3B active4-bit | 80.9one runPP 2779.0 (one run)llama.cppcontext not stated | 14.9one runPP 212.1 (one run)llama.cppcontext 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 | M3 Ultra 512GB | AMD Radeon 890M |
|---|---|---|
| Qwen3.5 35B · 3B active | 28.7 t/sFP16 | not in the calculator yet |
| Qwen3.8 27B | 8.0 t/sFP16 | not in the calculator yet |
| Qwen3.8 125B · 6B active | 13.6 t/sFP16 | not in the calculator yet |
| Qwen3.6 35B · 3B active | 28.7 t/sFP16 | not in the calculator yet |
| DeepSeek V4 Flash 284B · 13B active | 22.6 t/sQ8_0 | not in the calculator yet |
| Qwen3.6 27B | 8.0 t/sFP16 | not in the calculator yet |
| Gemma 4 26B · 4B active | 21.5 t/sFP16 | not in the calculator yet |
Change the context, RAM or model in the calculator: M3 Ultra 512GB · AMD Radeon 890M
Every report on each card, with its source: M3 Ultra 512GB · AMD Radeon 890M