AMD Radeon 780M vs NVIDIA RTX 3090 for local LLMs
5 reports on the AMD Radeon 780M and 165 on the NVIDIA RTX 3090
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 7.8x higher on the NVIDIA RTX 3090 (120 GB/s on the AMD Radeon 780M, 936 on the NVIDIA RTX 3090). The estimates below compare them on the models people run most.
AMD Radeon 780M
- Memory
- shared memory unified
- Memory bandwidth
- not on record
- FP16 compute
- not on record
- Reports
- 5
NVIDIA RTX 3090
- Memory
- 24GB
- Memory bandwidth
- 936 GB/s
- FP16 compute
- 142 TFLOPS
- Reports
- 165
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 Radeon 780M | NVIDIA RTX 3090 |
|---|---|---|
| Qwen3.8 27B | not in the calculator yet | 33.9 t/sQ4_K_M |
| Qwen3.8 125B · 6B active | not in the calculator yet | 19.4 t/sQ2_K, experts in RAM |
| DeepSeek V4 Flash 284B · 13B active | not in the calculator yet | doesn't fit at these settings |
| Qwen3.6 35B · 3B active | not in the calculator yet | 120.1 t/sQ4_K_S |
| Qwen3.6 27B | not in the calculator yet | 33.9 t/sQ4_K_M |
| Gemma 4 26B · 4B active | not in the calculator yet | 76.4 t/sQ5_K_S |
Change the context, RAM or model in the calculator: AMD Radeon 780M · NVIDIA RTX 3090
Every report on each card, with its source: AMD Radeon 780M · NVIDIA RTX 3090