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Quick Answer
750W is tight for the RTX 4080 and i7-13700K. This combo draws approximately 450-520W under gaming load, with transient spikes pushing higher. An 850W PSU is the safer and recommended choice for this high-end pairing.
Running at 70% capacity is fine for steady loads, but GPU transient spikes can push total system draw to 600W+ for brief periods. A 750W PSU with poor transient handling may trip protection. ATX 3.0 750W units handle this better than older designs.
For a system costing $3000+ AUD, spending an extra $30-50 on an 850W PSU is sensible. You get comfortable headroom, better efficiency at load, quieter fan operation, and room for future upgrades.
If you have a quality 750W ATX 3.0 PSU from a top brand (Corsair, Seasonic, be quiet!), it will likely work. Monitor for random shutdowns during intense gaming - if they occur, the PSU is the likely culprit.
Our Verdict
750W works but is tight for the RTX 4080 + 13700K. We recommend 850W for reliable, worry-free operation. The extra cost is insignificant compared to the total build price.
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.
Yes, 750W is enough for the RTX 4070 Ti and 7800X3D. This system draws approximately 380-420W under full gaming load. A 750W 80+ Gold PSU provides ample headroom and handles power transients safely.
Yes, 850W is enough for the RTX 4080 Super and i7-14700K. This high-end system draws approximately 480-550W under full gaming load. An 850W PSU provides sufficient headroom for power spikes and maintains good efficiency.