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Quick Answer
Yes, 650W is enough for the RTX 4070 and i5-13400F. This combo draws approximately 350-380W under full gaming load. A quality 650W 80+ Gold PSU provides adequate headroom with 270W to spare for drives, fans, and power spikes.
Understanding your system's actual power consumption is key to choosing the right PSU. This combo is one of the most efficient mid-range gaming setups you can build.
A quality 650W PSU delivers its full rated wattage continuously. With a 380W gaming load, you are running at about 58% capacity, which is actually the efficiency sweet spot for 80+ Gold PSUs. Power spikes from the RTX 4070 are well within the transient handling capability of any reputable 650W unit.
A cheap 650W PSU can be worse than a quality 550W one. Look for 80+ Gold certification, reputable brands (Corsair RM, Seasonic Focus, EVGA SuperNOVA, be quiet! Straight Power), and at least a 7-year warranty.
If the price difference is under $30 AUD, a 750W PSU gives you more headroom for future GPU upgrades. But 650W is technically sufficient and safe for this specific combo.
Our Verdict
650W is enough for the RTX 4070 + i5-13400F with 270W of headroom. Choose a quality 80+ Gold unit from a reputable brand. If you plan to upgrade the GPU later, consider 750W for future-proofing.