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Quick Answer
A 600W PSU is cutting it close for the RX 7800 XT. AMD recommends a 700W minimum. With a 263W TDP and power spikes up to 310W, a 600W PSU leaves minimal headroom. We recommend 650W minimum or ideally 700W for reliable operation.
AMD's 700W recommendation accounts for high-power CPUs, multiple drives, and power spikes. With an efficient CPU like the Ryzen 5 7600, a 650W PSU works. A 600W unit is technically sufficient but runs at 70% capacity during peaks, leaving minimal headroom for transients.
A quality 600W 80+ Gold PSU from a top brand will likely work. A budget 600W unit may trigger overcurrent protection under peak loads. If you already own a quality 600W PSU, try it before buying new. If buying new, spend the extra $15-20 for 650-700W.
Our Verdict
600W is risky for the RX 7800 XT. We recommend 650W minimum and 700W for comfortable headroom. The small extra cost for a higher wattage PSU is worth the reliability and peace of mind.