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HP and Compaq Desktop PCs - Motherboard Specifications, M2N78-LA (Violet)

Figure 1: The M2N78-LA (Violet) motherboard

Motherboard description

  • Manufacturer's motherboard name: Pegatron M2N78-LA

  • HP/Compaq name: Violet-GL8E

Form Factor

  • Micro-ATX: 24.4 cm (9.6 inches) x 24.4 cm (9.6 inches)


  • NVIDIA GeForce 9100

Front-side bus speed

  • 5200MT/s (5.2 GT/s)

Processor upgrade information

Socket type: AM2


Motherboard supports the following processor upgrades:

  • AMD Athlon X2 (Bt)

  • AMD Athlon 64 X2 up to 6000+ (W)

  • AMD Phenom Triple-Core up to 8xxx (AM2+) (Toliman)

  • AMD Phenom Quad-Core 9xxx series (AM2+) up to 9850 (Agena)

Memory upgrade information

  • Dual channel memory architecture

  • Four DDR2 SO-DIMM (240-pin) sockets

  • Supported DIMM types:

    • PC2-6400 (800 MHz)

    • PC2-5300 (667 MHz)

  • Non-ECC memory only, unbuffered

  • Supports 4GB DDR2 DIMMs

  • Supports up to 16 GB on 64-bit PCs

  • Supports up to 4 GB* on 32-bit PCs

    • 32 bit PCs cannot address a full 4.0 GB of memory.


Integrated graphics using nVidia GeForce 9100

*Integrated video is not available if a graphics card is installed.

  • Integrated graphics using nVidia GeForce 9100.

  • Supports concurrent use of dual displays connected to onboard DVI and VGA connectors.

  • Also supports PCI Express x16 graphics cards as independent graphics adapters.*


Integrated Realtek ALC888S Audio

*Integrated audio is not available if a sound card is installed.

  • Audio CODEC: Realtek ALC888S

  • High Definition 8 channel audio

  • Supports one S/PDIF digital connection


LAN: 10-Base-T

  • Interface: Integrated into motherboard

  • Technology: Realtek RTL8201N

  • Data transfer speeds: up to 10/100Mb/s

  • Transmission standards:10-Base-T Ethernet

Expansion Slots

  • One PCI Express x16

  • Three PCI Express x1

I/O Ports

Back I/O ports

Figure 2: Back I/O pane

1 - PS/2 mouse (green)
2 - S/PDIF coaxial out
3 - Video Graphics Adapter
4 - IEEE 1394
5 - RJ-45 Network (LAN)
6 - Audio: Center/Subwoofer (yellow orange)
7 - Audio: Rear Speaker Out (black)
8 - Audio: Line In (light blue)
9 - Audio: Line Out (lime)
10 - Audio: Microphone (pink)
11 - Audio: Side Speaker Out (gray)
12 - USB 2.0: 4
13 - DVI
14 - PS/2 keyboard (purple)

Internal Connectors

  • One 24-pin ATX power connector

  • One 4-pin ATX power connector

  • Four SATA connectors

  • One floppy drive connector

  • Two 12V fan connectors for CPU fan and chassis fan

  • One 9-pin header for power button, reset button, power LED, and HDD LED

  • One S/PDIF digital audio output header

  • One front line input connector

  • One 9-pin audio header for headphone-out and microphone-in (yellow, requires matching front audio jack module)

  • Six USB headers supporting sight USB 2.0 ports or devices

  • One 1394a header

  • One SPI (ROM programming) connector

  • One jumper for resetting BIOS settings

  • One jumper to disable BIOS password checking

Motherboard layout

Figure 3: layout

Clearing the CMOS settings

CAUTION: Do not change any jumper setting while the computer is on. Damage to the motherboard can result.

This motherboard has a jumper to clear the Real Time Clock (RTC) RAM in CMOS.

To clear CMOS, follow these steps:

  1. Temporarily set jumper CLEAR_CMOS to pins 1-2.

  2. Wait 5-10 seconds and then return the jumper to pins 2-3.

  3. When you start the PC you will need to enter BIOS setup to reset any custom BIOS settings.

Clearing the BIOS password

The BIOS password is used to protect BIOS settings from unwanted changes. If you have forgotten your password you may disable password checking.

To erase the BIOS password follow these steps:

  1. Turn OFF the computer and unplug the power cord.

  2. Locate the jumper labeled CLEAR_PW.

  3. Move the jumper CLEAR_PW to pins 1-2.

  4. Plug in the power cord and turn ON the computer.

  5. Hold down the F10 key during the startup process and enter BIOS setup to change or clear the password.

  6. After changing or clearing the BIOS passwords, remember to reset the jumper to pins 2-3.

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