Dell Optiplex 740 745 755 SFF Small Form Factor 275 Watt Power Supply MH300
Genuine Dell 275w Power Supply originally made for the Optiplex 960, but also works perfectly in the following small form factor systems: Optiplex 740, 745, 755, GX520, GX620. Dimension 5100c, 5150c, 9200c. XPS 200, 210.  This PSU is much more quiet and uses less power to do the same tasks.  It replaces all the 220w and 275w models listed and is guaranteed to perform perfectly.Genuine DELL 275w Power SupplyNew Replacement PSU for Dell Small Form Factor Systems:Optiplex 740, 745, 755, GX520, GX620. Dimension 5100c, 5150c, 9200c. XPS 200, 210Replaces the following Dell Part Numbers:MH300, RW739, YK840, KH620, YD358, R8038, N8368, XM554,K8964, YD080, TD570, N8373, FR619, PW124, RM117, WU142H220P-01, N220P-01, N275P-00, H275P-00, HP-L275GF3P, H275P-01, D275P-00, L275E-01, N275P-01, H275E-00, D275P-00, H275P-01, L275E-01, HP-L2767FPI LF, DPS-275CB-1A, HP-U2757F331 LF, PS-5271-3DF1-LE Connectors:    1x 24-Pin ATX Power Connector    1x 4-Pin ATX Power Connector    1x SATA HDD Power Connector    1x Slimline SATA Power1x 4-Pin Optical Drive Power(Optional adapter included)