This item is in good condition and has been tested working. Please refer to the stock photo to insure the item will work for your application. This item is Dell part number MC638 (or a compatible part number).    

Dimension: C521, 3100C
Optiplex: 210L, 320, 330, 740, 745, 755, GX280, GX520, GX620
   * 1 - 24-Pin ATX Power Connector (P1)  
   * 1 - 4-Pin ATX 12V Power Connector (P2)
   * 1 - 4-pin IDE Drive Power Connector (P3)
   * 1 - 4-pin Berg Floppy Drive Power Connector (P4)
   * 1 - 15-pin Serial ATA Power Connector (P5)  
Grade - B
Dell Part #: MC638
Model #: H220P-00