Dell OptiPlex 790 Owner's Manual page 86

Memory
Capacity
Minimum Memory
Maximum memory
Desktop, Mini-Tower, Small Form
Factor
Ultra Small Form Factor
Video
Integrated
Discrete
Video memory
Audio
Integrated
Network
Integrated
Expansion Bus
Bus Type
Bus Speed
86
1 GB, 2 GB, and 4 GB
1 GB
16 GB
8 GB
• Intel HD Graphics
• Intel HD Graphics 2000
PCI Express x16 graphics adapter
up to 1.7 GB shared video memory
(Microsoft Windows Vista and Windows 7)
four Channel High Definition Audio
Intel 82579LM Ethernet capable of
10/100/1000 Mb/s communication
• PCI 2.3
• PCI Express 2.0
• SATA 1.0, 2.0, 3.0
• USB 2.0
PCI Express:
• x1-slot bidirectional speed – 500 MB/s
• x16-slot bidirectional speed – 16 GB/s
SATA: 1.5 Gbps, 3.0 Gbps, and 6.0 Gbps