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Quick Answer
The ideal PSU wattage for the RTX 4070 and Ryzen 7 7700X is 650W. This combo draws approximately 340-380W under gaming load. A 650W 80+ Gold PSU runs at optimal efficiency while providing 270W of headroom for spikes.
At 380W load, a 650W PSU operates at 58% capacity. This hits the efficiency sweet spot for 80+ Gold certified units (typically 50-60% load). You get the lowest electricity cost, coolest operation, and quietest fan speeds.
Our Verdict
Go with a 650W 80+ Gold PSU for the RTX 4070 + Ryzen 7 7700X. It is the perfect balance of efficiency, headroom, and value. Only go 750W if you plan to upgrade to a more powerful GPU within the next 2 years.
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.
Yes, 700W is enough for the RTX 4070 Super with any mainstream CPU. The RTX 4070 Super has a 220W TDP, and total system power typically stays under 400W. NVIDIA recommends 650W, so 700W gives you comfortable headroom.
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.