Dell OptiPlex 755 User's Guide - Page 177
Small Form Factor Computer Specifications, This option uses the PCI slot., PCI Express
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Drives Externally accessible Internally accessible one bay for a slimline floppy drive; one bay for a slimline optical drive one bay for a 1-inch-high hard drive Connectors External connectors: Serial 9-pin connector; 16550C-compatible Parallel 25-pin connector (bidirectional) Optional PS/2 with secondary serial two 6-pin mini-DINs port adapter NOTE: This option uses the PCI slot. Video 15-pin VGA connector Network adapter RJ45 connector USB two front-panel and six back panel USB 2.0-compliant connectors Audio two connectors for line-in/ microphone and line-out; two frontpanel connectors for headphones and microphone System board connectors: internal USB 10-pin header for optional media card reader (in 3.5-inch drive bay) SATA two 7-pin connectors eSATA one 7-pin connector Floppy drive 34-pin connector Serial 12-pin connector for optional secondary serial port card Fan two 5-pin connectors PCI 2.3 one 120-pin connector PCI Express one 164-pin (x16) connector Front panel 40-pin connector Small Form Factor Computer Specifications 177