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Quick Answer
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.
The RTX 4080 Super and i7-14700K are both power-hungry components. Combined with transient spikes from the GPU, a 750W PSU would operate too close to its limit. The 850W gives you a comfortable 300W buffer for spikes and ensures long-term reliability.
If your RTX 4080 Super uses a 12VHPWR connector, an ATX 3.0 PSU with a native 12VHPWR cable is preferred. This eliminates the adapter and handles transient spikes better. Many quality 850W ATX 3.0 units are now available under $200 AUD.
During combined CPU + GPU stress tests (unlikely in real use), this system can draw up to 700W. An 850W PSU handles even this extreme scenario, confirming it is the right choice.
Our Verdict
850W is the right choice for the RTX 4080 Super + i7-14700K. It provides solid headroom without overspending. Look for ATX 3.0 models with native 12VHPWR for the cleanest build.