Tested and cleaned genuine Dell power supplies for SFF(small form factor) Dell Optiplex models 390, 790, 990, 3010, 7010 and 9010. These will not fit in Desktop(DT) or in Mini Tower(MT) versions.  Theses power supplies have many different part numbers but all are compatible and look identical.  These part numbers include 2TXYM, 3WN11, 709MT, 1GC38, 7NF62, CV7D3, CCCVC, RV1C4, J50TW, 592JG, 66VFV, 3YKG5 and PH3C2.   PLEASE CHECK PICTURES TO CONFIRM COMPATIBILITY.  Satisfaction guaranteed.  Thanks!