Dell OptiPlex DCCY Setup And Quick Reference Manual page 36

Memory (continued)
Memory capacities
Minimum memory
Maximum memory
Video
Type:
Integrated
Discrete
Audio
Type
Expansion Bus
Bus type
Bus speed
36
Specifications
512-MB, 1-GB, 2-GB, 3-GB, or 4-GB non-ECC
512 MB
4 GB
Intel integrated video
up to 256-MB video memory (shared) at total system
memory of greater than 512 MB
PCI Express x16 slot can support either a PCI Express
card or a DVI graphics card (for dual-monitor
support)
NOTE:
The ultra small form factor computer supports
integrated video only.
ADI 1984A high definition audio
PCI 2.3
PCI Express 2.0
SATA 1.0A and 2.0
eSATA
USB 2.0
PCI: 133 MB/s
PCI Express:
x1-slot bidirectional speed — 250 MB/s
x16-slot bidirectional speed — 8 GB/s
SATA: 1.5 Gbps and 3.0 Gbps
eSATA: 3.0 Gbps
USB: 480 Mbps