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Quick Answer
The best case for the RTX 4090 with optimal airflow is the Fractal Design Torrent at around $250 AUD. It fits the 4090's massive 336mm+ length with room to spare, has excellent bottom-to-top airflow, and includes two 180mm fans for outstanding cooling.
Before buying a case, check your specific 4090 model's length:
Your case needs at least 360mm GPU clearance, and ideally 380mm+ to avoid cable management issues.
The Torrent's bottom-to-top airflow design is ideal for the RTX 4090. Two 180mm front fans push massive air volume directly at the GPU. Supports GPUs up to 423mm with 7+ expansion slots. The RTX 4090 runs 5-8C cooler here than in most other cases.
A mesh-front mid-tower with excellent airflow and GPU clearance up to 410mm. Includes three 140mm fans. Great price-to-performance for RTX 4090 builds.
Spacious dual-chamber design with room for a 4090 and extensive water cooling. GPU clearance up to 420mm. Excellent cable management with the dual-chamber layout.
The RTX 4090 weighs 2-2.5 kg and will sag without support. Most good cases now include GPU support brackets. If yours does not, budget $15-20 AUD for an aftermarket GPU support bracket.
Our Verdict
The Fractal Design Torrent is purpose-built for massive GPUs like the RTX 4090. Its unique airflow design keeps the card cool while looking clean. Make sure you account for GPU sag support regardless of which case you choose.