Dell OptiPlex 990 Mini-Tower Service Manual page 89

Expansion Bus
Cards
PCI
Mini-Tower
Desktop
Small Form Factor
Ultra Small Form Factor
PCI Express x1
Mini-Tower
Desktop
Small Form Factor
Ultra Small Form Factor
PCI-Express x16
Mini-Tower
Desktop
Small Form Factor
Ultra Small Form Factor
Mini PCI Express
Mini-Tower
Desktop
Small Form Factor
Ultra Small Form Factor
Drives
Externally Accessible (5.25–inch drive bays)
• x16-slot bidirectional speed – 16 GB/s
SATA: 1.5 Gbps, 3.0 Gbps, and 6 Gbps
up to one full-height card
up to one low-profile card
none
none
up to three full-height cards
up to three low-profile cards
up to two low-profile cards
none
up to two full-height cards
up to two low-profile cards
up to two low-profile cards
none
none
none
none
up to one half-height card
89