Dell OptiPlex 780 - Manual (Page 7)

Network
Integrated Intel integrated network interface card
capable of 10/100/1000 Mb/s
communication
System Information
Chipset Intel® Q45 Express chipset w/ICH10DO
DMA channels eight
Interrupt levels 24
BIOS chip (NVRAM) 64 Mb
Expansion Bus
Bus type PCI 2.3
PCI Express 2.0
SATA 1.0A and 2.0
eSATA
USB 2.0
Bus speed 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
Cards
PCI
Mini-tower
Desktop
Small form factor
up to two full height cards
without riser card — up to two low profile
cards
with riser card — up to two full height
cards
one low profile card
PCI Express x1
Mini-tower
Desktop
Small form factor
one full height card
none
none
PCI Express x16
Mini-tower
Desktop
one full height card
without riser — one low profile card
with riser — one full height card