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This 400W replacement switching power supply is manufactured per original HP factory specification, specially engineered for HP Z210 and Z220 convertible mini tower workstation, cross replaces original part codes DPS-400AB-13A, 619397-001 and 619564-001. Same physical size and wiring layout enable direct swap for defective stock PSU without extra adapters or case cutting. Active power factor correction and high gold-grade energy efficiency reduce operational electricity cost for design studio, engineering workstation and small business data host. Adaptive speed fan balances heat dissipation and running noise, comprehensive safety protection effectively prevents hardware burnout caused by unstable grid power, cost-effective maintenance spare part for HP workstation repair and discrete GPU upgrade.