Head to head

RTX 4090 vs RTX 5080

The RTX 4090 holds more — 24 GB against 16 GB — which decides what you can load at all. The RTX 4090 has more bandwidth at 1008 GB/s, which decides how fast tokens come out once a model fits.

Model (Q4_K_M, 8K)RTX 4090tok/sRTX 5080tok/s
Llama 3.1 8B Runs comfortably 116 Runs comfortably 121
Llama 3.1 70B Won't fit 1.60 Won't fit 1.35
Llama 3.2 3B Runs comfortably 254 Runs comfortably 266
Llama 3.2 1B Runs comfortably 669 Runs comfortably 700
Llama 4 Scout 109B-A17B Won't fit 5.18 Won't fit 4.91
Qwen3 8B Runs comfortably 112 Runs comfortably 117
Qwen3 14B Runs comfortably 65.5 Runs comfortably 68.7
Qwen3 32B Fits, but tight 30.5 Won't fit 4.98
Qwen3 4B Runs comfortably 202 Runs comfortably 212
Qwen3 30B-A3B Runs comfortably 118 Won't fit 46.2
Qwen3 235B-A22B Won't fit 3.23 Won't fit 3.36
Qwen2.5-Coder 32B Fits, but tight 30.5 Won't fit 4.98
Qwen2.5 7B Runs comfortably 128 Runs comfortably 135
Qwen2.5 72B Won't fit 1.53 Won't fit 1.31
Gemma 3 4B Runs comfortably 215 Runs comfortably 226
Gemma 3 12B Runs comfortably 78.5 Runs comfortably 82.3

Specifications

RTX 4090RTX 5080
Memory24 GB16 GB
Bandwidth1008 GB/s960 GB/s
FP16 compute165 TFLOPS112 TFLOPS
Launch price$1,599$999
ArchitectureAdaBlackwell