How many types of cable harnesses are there for a desktop personal computer?
Release time:
2026-05-15
Source:
The wiring harness of a standard desktop computer can be categorized into two main types—internal and external—comprising roughly 10 to 15 distinct cable types, as follows:
I. Internal Wiring (Inside the Chassis)
Motherboard 24-pin power cable: the main cable that supplies power to the motherboard, and it is the thickest and widest.
CPU 4+4-pin (8-pin) power cable: Provides dedicated power to the CPU and is positioned close to the CPU socket.
Graphics card PCIe power cables: 6-pin, 8-pin (6+2-pin), and 16-pin, used to supply power to the graphics card.
SATA power cable: L-shaped flat connector, used to supply power to 2.5-inch and 3.5-inch hard drives and optical drives.
SATA power cable
SATA data cable: a thin, flat cable that connects the motherboard to a SATA hard drive or SSD for data transfer.
SATA data cable
M.2 SSDs have no physical cables: they plug directly into the motherboard, eliminating the need for additional cables.
Case front panel jumper (F_PANEL):
Power switch (PWR_SW)
Reset button (RESET_SW)
Power LED (PWR_LED)
Hard disk drive light (HDD_LED)
Chassis front panel jumper
Front USB cable:
USB 2.0 (9-pin)
USB 3.0/3.1 (19/20 pins, blue)
Front USB cable
Front-panel audio cable (HD Audio/AC’97): Connects the chassis headphone/microphone jacks to the motherboard.
Front audio cable
Fan wire:
3-pin (constant speed)
4-pin PWM (speed control), used for CPU fans and case fans.
Computer fan cable
RGB light beam:
5V ARGB (3-pin)
12V RGB (4-pin), for fans and LED strips.
Computer RGB lighting
II. External Wiring Harness (Outside the Chassis)
Host power cord: three-pronged, connecting the outlet to the power source.
Computer power supply cable
Monitor video cables: HDMI, DP, DVI, VGA.
HDMI cable
Ethernet cable (RJ45): Connects to the router or switch.
Ethernet cable
Mouse/keyboard cable: USB or wireless receiver.
USB mouse cable
Audio cables: 3.5mm headphone/speaker cable, optical fiber, HDMI audio.
3.5mm audio cable
III. Summary
Internal: Power supply connectors (24-pin, CPU, graphics card, SATA), data cables (SATA), front panel controls (power switch, USB, audio), and fan/RGB headers.
External: host power, video, network, keyboard and mouse, audio.
Total: Approximately 12 core lines, which can expand to around 15 when including granular interfaces.
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