NVIDIA RTX 4090 vs NVIDIA RTX A4000 16GB for local LLMs
57 reports on the NVIDIA RTX 4090 and 2 on the NVIDIA RTX A4000 16GB
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 2.3x higher on the NVIDIA RTX 4090 (1,008 GB/s on the NVIDIA RTX 4090, 448 on the NVIDIA RTX A4000 16GB). The estimates below compare them on the models people run most.
NVIDIA RTX 4090
- Memory
- 24GB
- Memory bandwidth
- 1,008 GB/s
- FP16 compute
- 330 TFLOPS
- Reports
- 57
NVIDIA RTX A4000 16GB
- Memory
- 16GB
- Memory bandwidth
- 448 GB/s
- FP16 compute
- 76.7 TFLOPS
- Reports
- 2
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 4090 | NVIDIA RTX A4000 16GB |
|---|---|---|
| Qwen3.8 27B | 36.5 t/sQ4_K_M | 29.2 t/sQ2_K |
| Qwen3.8 125B · 6B active | 19.6 t/sQ2_K, experts in RAM | doesn't fit at these settings |
| Qwen3.6 35B · 3B active | 129.3 t/sQ4_K_S | 96.6 t/sQ2_K |
| DeepSeek V4 Flash 284B · 13B active | doesn't fit at these settings | doesn't fit at these settings |
| Qwen3.6 27B | 36.5 t/sQ4_K_M | 29.2 t/sQ2_K |
| Gemma 4 26B · 4B active | 82.3 t/sQ5_K_S | 65.1 t/sQ3_K_S |
Change the context, RAM or model in the calculator: NVIDIA RTX 4090 · NVIDIA RTX A4000 16GB
Every report on each card, with its source: NVIDIA RTX 4090 · NVIDIA RTX A4000 16GB