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Quick Answer
Yes, 1200W is overkill for almost every single-GPU gaming PC in 2026. Even the most power-hungry combo (RTX 4090 + i9-14900K) draws only 650-750W under gaming load. A 1200W PSU is only justified for dual-GPU workstation builds or extreme overclocking setups.
The most power-hungry gaming setup in 2026:
Even the worst case scenario leaves 300W unused with a 1200W PSU.
PSUs are most efficient at 50-80% load. A 1200W PSU running a 400W system operates at 33% capacity, outside the peak efficiency range. You waste electricity and money on unused capacity.
Our Verdict
1200W is overkill for any standard gaming PC in 2026. Match your PSU to your components: 650-750W for mid-range, 850-1000W for high-end. Save the $50-100 AUD difference for something that impacts performance.