Head to head

RTX 4090 vs Radeon RX 7900 XTX

Both hold 24 GB, so capacity is a wash. 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/sRadeon RX 7900 XTXtok/s
Llama 3.1 8B Runs comfortably 116 Runs comfortably 105
Llama 3.1 70B Won't fit 1.60 Won't fit 1.52
Llama 3.2 3B Runs comfortably 254 Runs comfortably 230
Llama 3.2 1B Runs comfortably 669 Runs comfortably 609
Llama 4 Scout 109B-A17B Won't fit 5.18 Won't fit 4.91
Qwen3 8B Runs comfortably 112 Runs comfortably 101
Qwen3 14B Runs comfortably 65.5 Runs comfortably 59.3
Qwen3 32B Fits, but tight 30.5 Fits, but tight 27.6
Qwen3 4B Runs comfortably 202 Runs comfortably 183
Qwen3 30B-A3B Runs comfortably 118 Runs comfortably 112
Qwen3 235B-A22B Won't fit 3.23 Won't fit 3.07
Qwen2.5-Coder 32B Fits, but tight 30.5 Fits, but tight 27.6
Qwen2.5 7B Runs comfortably 128 Runs comfortably 116
Qwen2.5 72B Won't fit 1.53 Won't fit 1.44
Gemma 3 4B Runs comfortably 215 Runs comfortably 196
Gemma 3 12B Runs comfortably 78.5 Runs comfortably 71.1

Specifications

RTX 4090Radeon RX 7900 XTX
Memory24 GB24 GB
Bandwidth1008 GB/s960 GB/s
FP16 compute165 TFLOPS123 TFLOPS
Launch price$1,599$999
ArchitectureAdaRDNA3