RTX 5090 ComfyUI Setup: Ultimate Performance Guide

The NVIDIA RTX 5090 is a powerhouse GPU with 2,760 CUDA cores and 32GB of VRAM, ideal for advanced AI image generation using Flux with ComfyUI. This guide walks you through setup, optimization, and performance best practices.

🖥️ Installing NVIDIA Drivers for RTX 5090

Before running any AI workflows:

1. 🌐 Go to the NVIDIA Drivers Page.
2. Enter "RTX 5090" in the search field and click Start Search.
3. Choose Game Ready or Studio Driver — both work well.
4. Download and run the installer.

✅ Verify installation:

• Open Device Manager
• Check under Display Adapters
• Ensure RTX 5090 shows as “working properly”

🔁 Restart your computer to apply changes.

⚙️ Setting Up ComfyUI for RTX 5090

1. Visit the ComfyUI discussion/download page.
2. Download the Windows installer for RTX 50-series GPUs (includes CUDA 12.8).
3. Extract the archive to a new folder — this becomes your ComfyUI directory.

🧩 The installer includes everything needed to run Flux ComfyUI workflows smoothly.

📦 Downloading Required Models

For Flux to run properly, place model files in the correct folders:

• VAE folder → ae.safetensors
• CLIP folder → clip_l and t5xxl_fp16
• UNET folder → Your preferred .safetensors checkpoint

💡 Use FP16 models for great quality while conserving VRAM.

🚀 Running ComfyUI with the RTX 5090

• Double-click: "Run NVIDIA GPU.bat"
• ComfyUI will detect your RTX 5090 and display specs.

💾 You should see:

• 32GB VRAM
• System RAM availability (≥32GB recommended for Flux)

📊 Performance Results: RTX 5090 + Flux

🔍 Average performance metrics:

• 🖼️ Image generation time: 11–12 seconds
• 📈 GPU usage: ~100% during inference
• 📊 VRAM use: ~21GB on high-quality Flux models
• 🔌 Power draw: ~500 watts
• 🌡️ Operating temp: ~55°C under full load

📌 These stats make the 5090 ideal for pro-level AI image generation.

🛠️ Optimizing Your Workflow

To ensure maximum efficiency:

• Use monitoring tools like HWMonitor or MSI Afterburner
• Maintain high GPU utilization
• Watch VRAM usage to match image size and prompt complexity
• Plan for adequate power supply (850W+)

🌐 Alternative: Promptus (No-Code AI Image Platform)

If you want something simpler than ComfyUI:

Try Promptus, a browser and App AI platform with:

• 🧩 CosyFlows: a no-code ComfyUI-style interface
• 🤝 Real-time collaboration
• 🌟 Models like Gemini Flash and HiDream
• 🎮 Discord integration + workflow publishing

Perfect for creators or teams who prefer ease over full manual control.

✅ Final Thoughts

The NVIDIA RTX 5090 unlocks next-level performance for Flux ComfyUI workflows, offering:

• ⚡ Fast inference
• 🎨 Stunning visuals
• 💼 Professional efficiency

Whether you're using traditional ComfyUI or modern tools like Promptus, this GPU gives you the power to create without limits.