Dell Dimension C521 - Manual (Page 94)

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Appendix
Audio
Type Sigma Tel 9227 CODEC (7.1 Channel Audio)
Controllers
Drives two SATA controllers supporting two devices
Expansion Bus
Bus type PCI 2.3
PCI Express 1.0A
SATA 1.0A and 2.0
USB 2.0
Bus speed PCI: 133 MB/s
PCI Express x16: 40 Gbps bidirectional speed
PCI Express x1: 2.5 Gbps
SATA: 1.5 Gbps and 3.0 Gbps
USB: 480 Mbps high speed, 12Mbps full speed, 1.2 Mbps low
speed
Cards
PCI
connectors one
card size low profile
connector size 124 pins
connector data width
(maximum) 32 bits
PCI Express:
connectors one x1 and one x16
power 10 W (x1) and 25 W (x16) maximum
connector size 36 pins (x1) and 164 pins (x16)
connector data width
(maximum) one PCI Express lane (x1) and 16 PCI Express lanes (x16)
Drives
Externally accessible one 3.5-inch drive
one 5.25-inch drive bays
Available devices SATA hard drive, CD drive, DVD drive, DVD +/- RW drive, and
CD-RW/DVD Combo drive
Internally accessible one bay for a 1-inch-high hard drive