As with other devices reviewed here, because the FL-420TX adheres to the older ATX12V 1.3 specification, it uses the older 20 pin ATX connector. On the plus side, it includes nine 5.25" fan connectors as well as three floppy connectors. On the minus side, this unit includes only two SATA connections. But this unit is the only one to include a connection for an external (earth) ground where available. Next to the obligatory P4 connector, you'll also find an AUX connector as well. TMS controls come in the form of a 5.25" Molex connector with two controllable fan connections.
In working through our standard testing regime, the Yesico power supply demonstrated no problems at a Light Load rate. All measurements were within ATX specification tolerances, and at 73%, the operating efficiency for the unit was good. At Medium Load, all measurements were likewise stable and within acceptable norms, with an operating efficiency of nearly 77% (the best we measured). After running for an hour, the case temperature was only 113° F (45° C), and the TMS functions hadn't kicked in yet. At Maximum Load measurements were stable and within tolerances; the unit delivered all 420 watts without faults of any kind. But after a short while at max load, TMS kicked in and a connected system fan turned itself on. After about 45 minutes the power supply turned itself off, and the case temperature was a whopping 203° F (95° C) at that time.
Those willing to part with US$170 (160€) should be happy with this expensive device.
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