Based on this product's specifications, here are some alternatives and similar models
Power Supply Unit Inter-Tech ASPOWER U2A-B20500-S 500 W
Summary description:
The Inter-Tech ASPOWER U2A-B20500-S is a reliable 500 W power supply unit designed for servers. It features a 20+4 pin ATX connector and operates efficiently with an AC input voltage of 115 - 230 V, achieving 90% efficiency. With a mean time between failures (MTBF) of 100,000 hours, this stainless steel power supply ensures durability. It includes one 8 cm fan for cooling and has dimensions of 100 mm x 225 mm x 70 mm.