What is the wattage output and efficiency rating of this power supply unit?

300 Watts - This is an upgrade with additional wattage for additional devices, this replaces lower wattage power supplies

Does this power supply come with all the necessary cables for installation in a small form factor (SFF) desktop?

Yes, it comes with a main connector (20+4Pin), 12V P4 connector, 3 x 4-pin Molex connectors, 2 x SATA connectors, and 1 x Floppy connector, which are necessary for installation in a small form factor desktop.

Questions & Answers: Slimline Power Supply Upgrade for SFF Desktop Computer - Fits: Bestec FLX-250F1-I, FLX-250F1-J, FLX-250F1-K, FLX-250

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Slimline Power Supply Upgrade for SFF Desktop Computer - Fits: Bestec FLX-250F1-I, FLX-250F1-J, FLX-250F1-K, FLX-250

Guaranteed to fit your model Slimline Computer List below
1 x Main connector (20+4Pin) This works with both 20 pin and 24 pin main connectors!
1 x 12V P4 connector, 3 x 4-pin Molex Connector, 2 x SATA(Serial ATA) connector, 1 x Floppy connector
300 Watts - This is an upgrade with additional wattage for additional devices, this replaces lower wattage power supplies

$79^.99 –