Dell Dimension C521 - Manual (Page 34)

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 bay
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
Connectors
External connectors:
Video 15-hole VGA connector
Network adapter RJ45 connector
USB two front-panel and four back-panel USB 2.0–
compliant connectors
Audio six connectors for line-in and line-out; two front-panel
connectors for headphones and microphone
System board connectors:
SATA two 7-pin connectors
Floppy drive 34-pin connector
Fan 5-pin connector
PCI 2.3 124-pin connector
PCIe-x1 36-pin connector
PCIe-x16 164-pin connector
Internal USB 10-pin connector (supports two USB ports)
Speaker 6-pin connector
Memory modules four 240-pin connectors
Power 12V 4-pin connector
Power 24-pin connector
Battery 2-pin socket
Controls and Lights
Power control push button
Power light green light — Blinking green indicates a sleep mode;
solid green indicates a power-on state.
amber light — Blinking amber indicates a problem
with an installed device; solid amber indicates an
internal power problem (see
System Lights ).
Hard-drive access light green
LAN activity light (front panel) solid green light indicates network connection
Link integrity light (on integrated network adapter) green light for 10-Mb operation; orange light for 100-
Mb operation
Network activity light (on integrated network
adapter) yellow blinking light
Diagnostic lights Four lights on the front panel. See Diagnostic Lights .
Standby power light AUX_PWR on the system board