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Specifications

Dell™ Dimension™ C521 Service Manual

Microprocessor
Microprocessor type	AMD™ Athlon™ 64 X2 Dual-Core processor AMD Athlon 64 AMD Sempron™
Internal L2 cache	up to 1 MB per core up to 256 KB for Sempron

Memory
Type	533-MHz, 667-MHz, 800-MHz z (when available) DDR2 SDRAM
Memory connectors	four
Memory modules supported	256-MB, 512-MB, or 1-GB non-ECC
Minimum memory	256 MB
Maximum memory	4 GB

Computer Information
Chipset	nVidia GeForce 6150LE
DMA channels	eight
Interrupt levels	24
BIOS chip (NVRAM)	4 Mb
NIC	integrated network interface Capable of 10/100 communication

Video
Type	nVidia integrated video (DirectX 9.0c Shader Model 3.0 Graphics Processing Unit) or PCI Express x16 graphics card

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: 80 Gbps bidirectional speed PCI Express x1: 2.5 Gbps SATA: 1.5 Gbps and 3.0 Gbps USB: 480 Mbps high speed, 12 Mbps 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 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

Power
DC power supply:
Wattage	280 W
Heat dissipation	955.39 BTU/hr maximum NOTE: Heat dissipation is calculated based upon the power supply wattage rating.
Voltage	manual selection power supply — 90 to 135 V at 50/60 Hz; 180 to 265 V at 50/60 Hz
Backup battery	3-V CR2032 lithium coin cell

Physical
Height	11.4 cm (4.5 inches)
Width	39.9 cm (15.7 inches)
Depth	35.3 cm (13.9 inches)
Weight	10.4 kg (23 lb)

Environmental
Temperature:
Operating	10° to 35°C (50° to 95°F)
Storage	–40° to 65°C (–40° to 149°F)
Relative humidity	20% to 80% (noncondensing)
Maximum vibration:
Operating	0.25 G at 3 to 200 Hz at 0.5 octave/min
Storage	0.5 G at 3 to 200 Hz at 1 octave/min
Maximum shock:
Operating	bottom half-sine pulse with a change in velocity of 50.8 cm/sec (20 inches/sec)
Storage	27-G faired square wave with a velocity change of 508 cm/sec (200 inches/sec)
Altitude:
Operating	–15.2 to 3048 m (–50 to 10,000 ft)
Storage	–15.2 to 10,668 m (–50 to 35,000 ft)

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