HDPLEX 250W GaN ATX PSU uses advanced PFC+LLC structure, achieve 94% efficiency at full load while satisfy Level V Energy Efficiency standard. The PFC stage utlizes two automotive-grade GaN FET and LLC stage also utlizes two automotive-grade GaN FET. HDPLEX 250W GaN uses four ATX 1KV 8A TTR8MF chips for full-wave rectification and guarantee stable current for the output stage. 1% Resistor to ensure no deviation for every key point in the chain .