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Quick Answer
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 RTX 4080 Super is the sweet spot for 4K gaming. It handles every game at 4K High-Ultra settings at 60+ fps, and DLSS 3 Frame Generation pushes demanding titles well above that threshold.
Saves $400 versus the 4080 Super while delivering about 80% of the 4K performance. With DLSS enabled, it pushes most games above 60 fps at 4K, making it a capable entry point for 4K gaming.
The RX 7900 GRE can handle 4K at medium-high settings in many titles. 16GB VRAM is a major advantage at 4K where texture memory matters. Not as polished as NVIDIA at 4K, but excellent value.
The RTX 4090 ($2500 AUD) is 30-40% faster than the 4080 Super at 4K. Whether $1000+ extra is worth that depends on your budget. For most people, the 4080 Super hits the value sweet spot.
Our Verdict
The RTX 4080 Super at ~$1450 AUD is the definitive 4K GPU under $1500. DLSS 3 makes every game smooth at 4K. The RTX 4070 Ti Super at $1050 is the value pick if you are willing to lower a few settings.
The best 1440p GPU under $800 AUD is the RX 7800 XT at around $620 AUD. It delivers outstanding 1440p performance with 16GB VRAM for future-proofing. The RTX 4070 at $750 AUD is the alternative if you value DLSS 3 and ray tracing.
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.
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.