Dell OptiPlex 990 (Early 2011) - Manual (Page 90)

Memory
Desktop, Mini-Tower, Small Form
Factor 16 GB
Ultra Small Form Factor 8 GB
Video
Integrated
• Intel HD Graphics (with Intel Celeron/
Pentium-class CPU-GPU combo)
• Intel HD Graphics 2000 (with Intel Core
i3 DC 65 W and Intel Core i5/i7 QC
vPRO 95 W-class CPU-GPU combo)
Discrete PCI Express x16 graphics adapter
Audio
Integrated four Channel High Definition Audio
Network
Integrated Intel 82579LM Ethernet capable of
10/100/1000 Mb/s communication
System Information
System Chipset Intel 6 Series Express Chipset
DMA Channels two 82C37 DMA controllers with seven
independently programmable channels
Interrupt Levels Integrated I/O APIC capability with 24
interrupts
BIOS Chip (NVRAM) 80 MB (10 MB)
Expansion Bus
Bus Type PCI 2.3, PCI Express 2.0, SATA 3.0 and 2.0,
USB 2.0
Bus Speed: PCI Express:
• x1-slot bidirectional speed – 500 MB/s
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