NVIDIA A40 48GB vs NVIDIA A800 80GB for local LLMs
8 reports on the NVIDIA A40 48GB and 0 on the NVIDIA A800 80GB
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 2.8x higher on the NVIDIA A800 80GB (696 GB/s on the NVIDIA A40 48GB, 1,935 on the NVIDIA A800 80GB). The estimates below compare them on the models people run most.
NVIDIA A40 48GB
- Memory
- 48GB
- Memory bandwidth
- 696 GB/s
- FP16 compute
- 150 TFLOPS
- Reports
- 8
NVIDIA A800 80GB
- Memory
- 80GB
- Memory bandwidth
- 1,935 GB/s
- FP16 compute
- 312 TFLOPS
- Reports
- 0
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 A40 48GB | NVIDIA A800 80GB |
|---|---|---|
| Qwen3.8 27B | 14.2 t/sQ8_0 | 19.7 t/sFP16 |
| Qwen3.8 125B · 6B active | 64.5 t/sQ2_K | 116.7 t/sQ4_K_S |
| Qwen3.6 35B · 3B active | 44.7 t/sQ8_0 | 141.9 t/sQ8_0 |
| DeepSeek V4 Flash 284B · 13B active | doesn't fit at these settings | 9.4 t/sQ2_K, experts in RAM |
| Qwen3.6 27B | 14.2 t/sQ8_0 | 19.7 t/sFP16 |
| Gemma 4 26B · 4B active | 38.3 t/sQ8_0 | 50.7 t/sFP16 |
Change the context, RAM or model in the calculator: NVIDIA A40 48GB · NVIDIA A800 80GB
Every report on each card, with its source: NVIDIA A40 48GB · NVIDIA A800 80GB