SilverStone has recently introduced its latest power supply units(PSUs) to Strider Essential series.The series include two models, first one is 400W ST40F-ES and the second one is 500W ST50F-ES.Both the PSUs feature fixed (non-modular) cabling, ATX 2.3 compliance and 80 Plus certification.Both the PSUs are cooled by a 120 mm fan with a noise output of 18 dBA.Connectors apart from the 24-pin ATX and 4+4 pin CPU power connectors include two 6-pin PCI-E (for the 400W model), one 6-pin and 6+2 pin PCI-E connectors (for the 500W model), four SATA, three Molex, and one Floppy.The ST40F-ES is priced at US $49.99 and ST50F-ES is priced at US $59.99.