Dell OptiPlex 990 Desktop Service Manual page 98

System Board Connectors
Mini PCI Express data width (maximum) —
one PCI Express lane and one USB
interface
Mini-Tower, Desktop,
Small Form Factor
Ultra Small Form Factor
Serial ATA
Mini-Tower
Desktop
Small Form Factor
Ultra Small Form Factor
Memory
Mini-Tower, Desktop,
Small Form Factor
Ultra Small Form Factor
Internal USB
Mini-Tower, Desktop
Small Form Factor, Ultra
Small Form Factor
System Fan
Front panel control
Mini-Tower, Desktop,
Small Form Factor
Ultra Small Form Factor
Thermal Mini-Tower
Sensor
Desktop, Small Form
Factor, Ultra Small Form
Factor
98
none
one 52-pin connector
four 7-pin connectors
three 7-pin connectors
three 7-pin connectors
two 7-pin connectors
four 240-pin connectors
two 240-pin connectors
one 10-pin connector
none
one 5-pin connector
one 34-pin and one 5-pin connector
one 20-pin and one 14-pin connector
one 2-pin connector
two 2-pin connectors