NVIDIA A40 48GB vs NVIDIA H800 for local LLMs
8 reports on the NVIDIA A40 48GB and 0 on the NVIDIA H800
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 4.8x higher on the NVIDIA H800 (696 GB/s on the NVIDIA A40 48GB, 3,350 on the NVIDIA H800). 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 H800
- Memory
- 80GB
- Memory bandwidth
- 3,350 GB/s
- FP16 compute
- 989.5 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 H800 |
|---|---|---|
| Qwen3.8 27B | 14.2 t/sQ8_0 | 34.1 t/sFP16 |
| Qwen3.8 125B · 6B active | 64.5 t/sQ2_K | 202.0 t/sQ4_K_S |
| Qwen3.6 35B · 3B active | 44.7 t/sQ8_0 | 245.7 t/sQ8_0 |
| DeepSeek V4 Flash 284B · 13B active | doesn't fit at these settings | 9.6 t/sQ2_K, experts in RAM |
| Qwen3.6 27B | 14.2 t/sQ8_0 | 34.1 t/sFP16 |
| Gemma 4 26B · 4B active | 38.3 t/sQ8_0 | 87.8 t/sFP16 |
Change the context, RAM or model in the calculator: NVIDIA A40 48GB · NVIDIA H800
Every report on each card, with its source: NVIDIA A40 48GB · NVIDIA H800