NVIDIA A800 40GB vs NVIDIA RTX 3080 20GB for local LLMs
0 reports on the NVIDIA A800 40GB and 14 on the NVIDIA RTX 3080 20GB
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 NVIDIA A800 40GB (1,555 GB/s on the NVIDIA A800 40GB, 760 on the NVIDIA RTX 3080 20GB). The estimates below compare them on the models people run most.
- Memory
- 40GB
- Memory bandwidth
- 1,555 GB/s
- FP16 compute
- 312 TFLOPS
- Reports
- 0
- Memory
- 20GB
- Memory bandwidth
- 760 GB/s
- FP16 compute
- 119 TFLOPS
- Reports
- 14
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 A800 40GB | NVIDIA RTX 3080 20GB |
|---|---|---|
| Qwen3.8 27B | 31.7 t/sQ8_0 | 35.4 t/sQ3_K_M |
| Qwen3.8 125B · 6B active | 16.8 t/sQ3_K_S, experts in RAM | 19.1 t/sQ2_K, experts in RAM |
| Qwen3.6 35B · 3B active | 125.3 t/sQ6_K | 140.5 t/sQ3_K_S |
| DeepSeek V4 Flash 284B · 13B active | doesn't fit at these settings | doesn't fit at these settings |
| Qwen3.6 27B | 31.7 t/sQ8_0 | 35.4 t/sQ3_K_M |
| Gemma 4 26B · 4B active | 81.5 t/sQ8_0 | 79.7 t/sQ4_K_S |
Change the context, RAM or model in the calculator: NVIDIA A800 40GB · NVIDIA RTX 3080 20GB
Every report on each card, with its source: NVIDIA A800 40GB · NVIDIA RTX 3080 20GB