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Quick Answer
The RTX 4090 is 30-40% faster than the RTX 4080 at 4K but costs 70-80% more. The 4080 delivers 55-75 fps at 4K Ultra in most games, while the 4090 pushes 75-105 fps. For 4K 60fps gaming, the 4080 is sufficient. For 4K 120fps, only the 4090 delivers.
DLSS 3 closes the gap by making both cards more playable, but the 4090 still leads by 35-40%.
Cost per frame at 4K:
The 4080 delivers better value per frame. The 4090 is a luxury card for those who want the absolute best regardless of cost.
Our Verdict
The RTX 4080 delivers smooth 4K 60fps gaming and is the value choice. The RTX 4090 is for enthusiasts who want 4K 100+ fps or have the budget for the best. The $1050 AUD gap is hard to justify on value alone.
The best 4K GPU under $1500 AUD is the RTX 4080 Super at around $1400-1500 AUD. It delivers 60-80 fps at 4K Ultra in most titles, with DLSS 3 pushing many games above 100 fps. The RTX 4070 Ti Super at $1050 is the value alternative for 4K entry.
The best CPU for RTX 4090 4K gaming is the Ryzen 7 7800X3D. At 4K, every CPU from the Ryzen 5 7600 to the i9-14900K delivers identical frame rates because the GPU is the bottleneck. The 7800X3D is the sweet spot for its V-Cache advantage in the rare CPU-bound moments.
No, 1000W is not overkill for the RTX 4090. NVIDIA officially recommends an 850W PSU as minimum, and real-world systems with a high-end CPU can draw 650-750W under gaming load. The 1000W provides necessary headroom for transient spikes that can exceed 600W from the GPU alone.