I am using dell dimension 4400 at the moment. Its configurations are;
Microprocessor
Microprocessor type
Intel® Pentium® 4 microprocessor that runs at 1.50, 1.60, 1.70, 1.80, 1.90, 2.0, 2.20, or 2.40 GHz internally and 400 MHz externally
L1 cache
8 KB first-level
L2 cache
integrated 256-KB or 512-KB at full microprocessor speed
System Information
System chip set
Intel 845 with DDR memory support
DMA channels
four
Interrupt levels
15
System BIOS chip
4 Mb (512 KB)
System clock
400-MHz data rate
Expansion Bus
Bus types
PCI and AGP
Bus speed
PCI: 33 MHz; AGP: 66 MHz
AGP connector
one
AGP connector size
172 pins
AGP connector data width (maximum)
32 bits
AGP bus protocols
4x/2x modes at 1.5 V
PCI connectors
four
PCI connector size
120 pins
PCI connector data width
(maximum)
32 bits
Memory
Architecture
DDR SDRAM
Memory connectors
two
Memory capacities
128-, 256-, and 512-MB non-ECC DDR SDRAM
Minimum memory
128 MB
Maximum memory
1 GB
Memory type
DDR (non-ECC)
BIOS address
F8000h
Drives
Externally accessible
two 5.25-inch bays
two 3.5-inch bays
Internally accessible
two bays for 1-inch–high IDE hard drives
Available devices
ATA-66 or ATA-100 Ultra DMA hard drive, CD drive, Zip drive, DVD drive, DVD+RW drive, and CD-RW drive
Ports and Connectors
Externally accessible:
Serial
9-pin connector; 16550C-compatible
Parallel
25-hole connector (bidirectional)
Video
15-hole connector
Keyboard
6-pin mini-DIN connector or USB connector
Mouse
6-pin mini-DIN connector or USB connector
USB
two front-panel and two back-panel USB–compliant connectors
Headphone
front-panel miniature connector
Audio1
three miniature connectors for line-in, line-out, and microphone
Internally accessible:
Primary IDE channel
40-pin connector on PCI local bus
Secondary IDE channel
40-pin connector on PCI local bus
Floppy drive
34-pin connector
1 Present only on computers with integrated audio capabilities.
Audio2
Audio controller
ADI 1885
2 Present only on computers with integrated audio capabilities.
Video
Video controller
AGP 4X
Controls and Lights
Power control
push button
Power light
green light on power button—blinking green in sleep state; solid green for power on state; solid amber for possible internal power problem
Hard-drive access light
green
Diagnostic code lights
four bicolor (amber and green) located on back panel
Power
DC power supply:
Wattage
250 W
Heat dissipation
534 BTU (fully-loaded computer without monitor)
Voltage (switch-selectable
on back panel)
90 to 135 V at 50/60 Hz; 180 to 265 V at 50/60 Hz; 100 V at 50/60 Hz for Japanese computers
Backup battery
3-V CR2032 coin cell
Physical
Height x Width x Depth
42.5 x 18.1 x 44.7 cm
(16.7 x 7.1 x 17.6 inches)
Weight
12.7 kg (28 lb)
Environmental
Temperature:
Operating
10º to 35ºC (50º to 95ºF)3
Storage
–40º to 65ºC (–40º to 149ºF)
Relative humidity
20% to 80% (noncondensing)
Maximum vibration:
Operating
0.25 G at 3 to 200 Hz at 1/2 octave/min
Storage
0.5 G at 3 to 200 Hz at 1/2 octave/min
Maximum shock:
Operating
bottom half-sine pulse with a change in velocity of 50.8 cm/sec (20 inches/sec)
Storage
23-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)3
Storage
–15.2 to 10,670 m (–50 to 35,000 ft)
3 At 35°C (95°F), the maximum operating altitude is 914 m (3000 ft).
[link=http://supportapj.dell.com/support/edocs/systems/dim4400/specs.htm#1103140]source[/link]
Just wants to know which Video card, processor will be good for me. Please remember that I cant go for power supplies as dell makes their Power supplies differently and other wont fit in it.