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Quick Answer
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 RX 7800 XT is the undisputed 1440p value champion. 16GB VRAM ensures you never run out of texture memory, and raw rasterization performance trades blows with the RTX 4070.
The RTX 4070 matches the 7800 XT in rasterization but adds DLSS 3 Frame Generation, superior ray tracing, and better power efficiency at 200W. If you play RT-heavy titles, this is the pick.
For $70 less than the 7800 XT, the RX 7700 XT delivers about 85-90% of the performance. 12GB VRAM is adequate for 1440p today. Great if you want to save for other components.
Capable at 1440p in most titles with DLSS enabled. The 8GB VRAM is the concern for 1440p longevity, but DLSS makes up for raw performance gaps.
Our Verdict
The RX 7800 XT at $620 AUD is our top pick for 1440p gaming under $800. The 16GB VRAM gives it the longest usable lifespan. Choose the RTX 4070 instead if ray tracing and DLSS 3 matter to you.