This power supply is a compatible replacement for Bestec part number TFX0250D5WB REV:A00 power supplies. If you own a Bestec part number TFX0250D5WB REV:A00 this TFX0250D5W power supply will fit without modification. We also offer this power supply upgrade that will replace your Bestec part number TFX0250D5WB REV:A00 power supply.