NVIDIA RTX 5090 vs AMD RX 6800 16GB for local LLMs
168 reports on the NVIDIA RTX 5090 and 1 on the AMD RX 6800 16GB
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 3.5x higher on the NVIDIA RTX 5090 (1,792 GB/s on the NVIDIA RTX 5090, 512 on the AMD RX 6800 16GB). The estimates below compare them on the models people run most.
NVIDIA RTX 5090
- Memory
- 32GB
- Memory bandwidth
- 1,792 GB/s
- FP16 compute
- 419 TFLOPS
- Reports
- 168
AMD RX 6800 16GB
- Memory
- 16GB
- Memory bandwidth
- 512 GB/s
- FP16 compute
- 32.3 TFLOPS
- Reports
- 1
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 | NVIDIA RTX 5090 | AMD RX 6800 16GB |
|---|---|---|
| Qwen3.8 27B | 44.9 t/sQ6_K | 33.4 t/sQ2_K |
| Qwen3.8 125B · 6B active | 20.3 t/sQ2_K, experts in RAM | doesn't fit at these settings |
| Qwen3.6 35B · 3B active | 163.0 t/sQ5_K_M | 110.4 t/sQ2_K |
| DeepSeek V4 Flash 284B · 13B active | doesn't fit at these settings | doesn't fit at these settings |
| Qwen3.6 27B | 44.9 t/sQ6_K | 33.4 t/sQ2_K |
| Gemma 4 26B · 4B active | 114.5 t/sQ6_K | 74.4 t/sQ3_K_S |
Change the context, RAM or model in the calculator: NVIDIA RTX 5090 · AMD RX 6800 16GB
Every report on each card, with its source: NVIDIA RTX 5090 · AMD RX 6800 16GB