RTX 4090 vs RTX Pro 6000 Blackwell - GPU Benchmark Comparison

Direct performance comparison between the RTX 4090 and RTX Pro 6000 Blackwell across 21 standardized AI benchmarks collected from our production fleet. Testing shows the RTX 4090 winning 4 out of 21 benchmarks (19% win rate), while the RTX Pro 6000 Blackwell wins 17 tests. All 21 benchmark results are automatically gathered from active rental servers, providing real-world performance data rather than synthetic testing.

LLM Inference Performance: RTX 4090 16% slower

In language model inference testing across 9 different models, the RTX 4090 is 16% slower than the RTX Pro 6000 Blackwell on average. For deepseek-r1:32b inference, the RTX 4090 reaches 45 tokens/s while the RTX Pro 6000 Blackwell achieves 64 tokens/s, making the RTX 4090 significantly slower with a 30% deficit. Overall, the RTX 4090 wins 2 out of 9 LLM tests with an average 20% performance difference, making the RTX Pro 6000 Blackwell the better option for LLM inference tasks.

Image Generation Performance: RTX 4090 49% slower

Evaluating AI image generation across 12 different Stable Diffusion models, the RTX 4090 is 49% slower than the RTX Pro 6000 Blackwell in this category. When testing sd3.5-medium, the RTX 4090 completes generations at 25 s/image while the RTX Pro 6000 Blackwell achieves 3.5 s/image, making the RTX 4090 substantially slower with a 86% deficit. Across all 12 image generation benchmarks, the RTX 4090 wins 2 tests with an average 49% performance difference, making the RTX Pro 6000 Blackwell the better choice for Stable Diffusion, SDXL, and Flux workloads.

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