NVIDIA RTX 3080 10GB vs NVIDIA RTX 4070 for local LLMs
2 reports on the NVIDIA RTX 3080 10GB and 9 on the NVIDIA RTX 4070
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 1.5x higher on the NVIDIA RTX 3080 10GB (760 GB/s on the NVIDIA RTX 3080 10GB, 504 on the NVIDIA RTX 4070). The estimates below compare them on the models people run most.
NVIDIA RTX 3080 10GB
- Memory
- 10GB
- Memory bandwidth
- 760 GB/s
- FP16 compute
- 119 TFLOPS
- Reports
- 2
NVIDIA RTX 4070
- Memory
- 12GB
- Memory bandwidth
- 504 GB/s
- FP16 compute
- 116 TFLOPS
- Reports
- 9
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 3080 10GB | NVIDIA RTX 4070 |
|---|---|---|
| Qwen3.8 27B | 2.1 t/sQ6_K, layers on CPU | 1.7 t/sQ8_0, layers on CPU |
| 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 | 17.3 t/sQ5_K_M, experts in RAM | 13.9 t/sQ6_K, experts in RAM |
| Qwen3.6 27B | 2.1 t/sQ6_K, layers on CPU | 1.7 t/sQ8_0, layers on CPU |
| Gemma 4 26B · 4B active | 8.9 t/sQ8_0, experts in RAM | 82.3 t/sQ2_K |
Change the context, RAM or model in the calculator: NVIDIA RTX 3080 10GB · NVIDIA RTX 4070
Every report on each card, with its source: NVIDIA RTX 3080 10GB · NVIDIA RTX 4070