Genuine Dell K8CDY 685-watt modular workstation power supply identified in Dell validation data as an EPA-rated Flextronics unit for Precision T7810-class systems and associated exact-part records with selected T5810/T7810/T7910 configurations. F685EF-01 appears with K8CDY in exact-label records. CYP9P, VDY4N, W4DTF, KTMT8, and other 685-watt numbers are clues only because contact layouts and power-distribution-board compatibility can differ. Power cord, power-distribution board, cables, mounting hardware, and accessories are not assumed included. This inventory record explicitly identifies the condition as New. Match K8CDY exactly, service tag, Precision model, complete F685EF-01 revision, 685-watt nameplate and every rail, EPA/efficiency marking, module dimensions, latch, gold contacts, connector board, and pinout before ordering.