NVIDIA GTX 1080 Ti vs NVIDIA RTX 5090 for local LLMs
2 reports on the NVIDIA GTX 1080 Ti and 114 on the NVIDIA RTX 5090
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 3.7x higher on the NVIDIA RTX 5090 (484 GB/s on the NVIDIA GTX 1080 Ti, 1,792 on the NVIDIA RTX 5090). The estimates below compare them on the models people run most.
NVIDIA GTX 1080 Ti
- Memory
- 11GB
- Memory bandwidth
- 484 GB/s
- FP16 compute
- 11.3 TFLOPS
- Reports
- 2
NVIDIA RTX 5090
- Memory
- 32GB
- Memory bandwidth
- 1,792 GB/s
- FP16 compute
- 419 TFLOPS
- Reports
- 114
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 GTX 1080 Ti | NVIDIA RTX 5090 |
|---|---|---|
| Qwen3.8 27B | 1.6 t/sQ8_0, layers on CPU | 44.9 t/sQ6_K |
| Qwen3.8 125B · 6B active | doesn't fit at these settings | 20.3 t/sQ2_K, experts in RAM |
| DeepSeek V4 Flash 284B · 13B active | doesn't fit at these settings | doesn't fit at these settings |
| Qwen3.6 35B · 3B active | 13.8 t/sQ6_K, experts in RAM | 163.0 t/sQ5_K_M |
| Qwen3.6 27B | 1.6 t/sQ8_0, layers on CPU | 44.9 t/sQ6_K |
| Gemma 4 26B · 4B active | 8.4 t/sQ8_0, experts in RAM | 114.5 t/sQ6_K |
Change the context, RAM or model in the calculator: NVIDIA GTX 1080 Ti · NVIDIA RTX 5090
Every report on each card, with its source: NVIDIA GTX 1080 Ti · NVIDIA RTX 5090