NVIDIA RTX 3090 vs AMD RX 9070 for local LLMs
182 reports on the NVIDIA RTX 3090 and 7 on the AMD RX 9070
Which is faster for local LLMs?
On Qwen3.8 27B at 3-bit, the NVIDIA RTX 3090 has 42.3 generation tokens/s (one run); prompt processing 1127.0 tokens/s (one run); the AMD RX 9070 has generation speed not reported; prompt processing 600.0 tokens/s (one run). Memory bandwidth, which caps how fast a card can write, is 46% higher on the NVIDIA RTX 3090 (936 GB/s on the NVIDIA RTX 3090, 640 on the AMD RX 9070).
- Memory
- 24GB
- Memory bandwidth
- 936 GB/s
- FP16 compute
- 142 TFLOPS
- Reports
- 182
- Memory
- 16GB
- Memory bandwidth
- 640 GB/s
- FP16 compute
- 145 TFLOPS
- Reports
- 7
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 | NVIDIA RTX 3090 | AMD RX 9070 |
|---|---|---|
| Qwen3.8 27B3-bit | 42.3one runPP 1127.0 (one run)llama.cpp16K context | -0 runsPP 600.0 (one run)llama.cpp128K 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 | NVIDIA RTX 3090 | AMD RX 9070 |
|---|---|---|
| Qwen3.8 27B | 33.9 t/sQ4_K_M | 41.7 t/sQ2_K |
| Qwen3.8 125B · 6B active | 19.4 t/sQ2_K, experts in RAM | doesn't fit at these settings |
| DeepSeek V4 Flash 284B · 13B active | doesn't fit at these settings | doesn't fit at these settings |
| Qwen3.6 35B · 3B active | 120.1 t/sQ4_K_S | 138.0 t/sQ2_K |
| Qwen3.6 27B | 33.9 t/sQ4_K_M | 41.7 t/sQ2_K |
| Gemma 4 26B · 4B active | 76.4 t/sQ5_K_S | 93.0 t/sQ3_K_S |
| GLM-5.3 320B · 18B active | doesn't fit at these settings | doesn't fit at these settings |
Change the context, RAM or model in the calculator: NVIDIA RTX 3090 · AMD RX 9070
Every report on each card, with its source: NVIDIA RTX 3090 · AMD RX 9070