AMD MI50 16GB vs AMD RX 6900 XT 16GB for local LLMs
5 reports on the AMD MI50 16GB and 2 on the AMD RX 6900 XT 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 2.0x higher on the AMD MI50 16GB (1,024 GB/s on the AMD MI50 16GB, 512 on the AMD RX 6900 XT 16GB). The estimates below compare them on the models people run most.
AMD MI50 16GB
- Memory
- 16GB
- Memory bandwidth
- 1,024 GB/s
- FP16 compute
- 26.5 TFLOPS
- Reports
- 5
AMD RX 6900 XT 16GB
- Memory
- 16GB
- Memory bandwidth
- 512 GB/s
- FP16 compute
- 46.1 TFLOPS
- Reports
- 2
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 | AMD MI50 16GB | AMD RX 6900 XT 16GB |
|---|---|---|
| Qwen3.8 27B | 66.7 t/sQ2_K | 33.4 t/sQ2_K |
| Qwen3.8 125B · 6B active | doesn't fit at these settings | 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 | 220.8 t/sQ2_K | 110.4 t/sQ2_K |
| Qwen3.6 27B | 66.7 t/sQ2_K | 33.4 t/sQ2_K |
| Gemma 4 26B · 4B active | 148.9 t/sQ3_K_S | 74.4 t/sQ3_K_S |
Change the context, RAM or model in the calculator: AMD MI50 16GB · AMD RX 6900 XT 16GB
Every report on each card, with its source: AMD MI50 16GB · AMD RX 6900 XT 16GB