Take a look at this Tyan Motherboard with 4 CPUs, running Opteron processors:

http://www.amdboard.com/tyan_s4880_opteron_board.html

Direct Image below:

http://say25.com/news/image.html?num...69921022_2.jpg

Motherboard Information

Processors
- Quad µPGA 940-pin ZIF sockets
- Supports up to four AMD Opteron 800 series processors
- Four onboard 3-phase VRMs
- Integrated 128-bit DDR Memory Controller

Chipset
- AMD-8131 HyperTransport PCI-X Tunnel
- AMD-8111 HyperTransport I/O Hub
- Winbond W83627HF Super I/O chip
- Total three Hardware Monitoring IC: (2) Analog Devices ADM1031 and (1) ADM1027

Memory
- 128-bit dual channel memory bus
- Total ten 184-pin 2.5-Volt DDR DIMM sockets (4 on CPU 0 and 2 each on CPU1, CPU2, CPU3 respectively)
- Supports up to 20 GB Registered DDR
- Supports ECC and ECC with Chipkill type memory modules
- Supports PC1600, PC2100, & PC2700 DDR

Expansion Slots
- Two independent PCI-X buses
- Two 64-bit 66/33 MHz (3.3-Volt) PCI-X slots from PCI-X bridge A
- Two 64-bit 100/66/33 MHz (3.3-Volt) PCI-X slots from PCI-X bridge B
- One legacy 32-bit 33MHz (5-Volt) PCI slot
- Total of five usable slots

Integrated I/O
- One floppy connector supports up to two drives
- Two 9-pin serial ports (one connector and one header) and One 25-pin parallel port connector
- PS/2 mouse and keyboard connectors
- Two USB v1.1 front panel headers
- Two USB v2.0 connectors through VT6202

System Management
- Total eleven 3-pin fan headers with tachometer monitoring
- Four fan headers with (PWM) speed control
- One 2-pin Chassis Intrusion header
- Temperature, voltage and fan monitoring

Integrated Enhanced IDE Controller
- Provides two IDE dual-drive ports for up to four EIDE devices
- Supports for UDMA 33/66/100/133 IDE drives and ATAPI compliant devices

Integrated PCI Graphics
- ATI Rage XL PCI graphics controller
- 8MB Frame Buffer of video memory Integrated Serial ATA Controller (manufacturing option)
- One Silicon Image SI3114 controllers
- Four SATA 1.0 ports
- Supports up Four SATA drives
- Supports RAID 0,1,0+1

Integrated Dual Channel SCSI (manufacturing option)
- LSI 53C1030 U320 SCSI controller
- Dual-channel Ultra320 SCSI
- Connects to PCI-X Bridge A
- Supports LSI ZCR (Zero Channel RAID)

Integrated LAN Controllers
- Broadcom BCM5704C dual-channel Gigabit Ethernet controller
¤ Two RJ-45 LAN connectors with LEDs
¤ Connected to PCI-X Bridge A
- Two Front Panel LED headers

Intelligent Platform Management Interface Header
- Tyan Server Management Daughter card (optional) supports features listed below via IPMI header
- QLogic Zircon Baseboard Management Controller (BMC) based on powerful ARM7 tech.
- Tailored for IPMI highest 1.5 Spec.
- Supports KCS and BT styles
- Flexible Windows and Linux based Management Solution
- Supports RMCP and SNMP protocols
- Supports ASF standard and EMP
- I2C serial multi-master controllers and UARTs
- Built-in IPMB connector
- Remote power on/off and reset support (IPMI-over-LAN)

BIOS
- Phoenix BIOS version 4.0
- 4Mbit LPC Flash ROM
- Watchdog timer
- USB boot support
- 48-bit LBA Support
- Supports PXE via Ethernet
- ACPI 2.0 & 1.0B support

Form Factor
- Extended ATX footprint (13” x 16” / 330.2mm x 406.4mm)
- EPS12V power connectors
- One serial port, one parallel port and one VGA connector
- Stacked USB 2.0 (two) connectors
- Stacked PS/2 keyboard and mouse connectors
- Two RJ-45 side-by-side LAN connectors with LEDs

Regulatory
- FCC Class B (Declaration of Conformity)
- European Community CE (Declaration of Conformity)

Board Schematics:

http://2cpu.co.kr/zboard/data/hardware/S4880_qr4.jpg