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The w2100z mb is actually made by Samtron I believe. It support two 940 pin Opterons with 4 slots DDR per processor. The second processor is on an (optional) mezzanine elevated plugin which allows the board to be housed in a small workstation box. The board comes with dual Adaptec U320 7902B interfaces as well SATA and ATA interfaces (2 each). Gigabit LAN is provided by a Broadcom NetXtreme BCM5703X controller which works with the bcm5700 driver just fine. The mainboard houses a PCI-X 133Mhz slot and a PCI-X 100Mhz slot... THEN the DAUGHTER slot board contains two more PCI-X 100Mhz slots and a PCI-X 100Mhz slot that can also handle a Zero channel RAID option. This daughter board also has an 8x AGP slot. The daughter board is where the U320 chips reside as well. MEANING, that future upgrades may be available that could add features like PCIe and possibly something like Serial Attached SCSI in place of the dual channel U320. I've used a lot of high motherboards, and this is one of the most impressive designs I've seen in a while.
Board has two PS2 jacks, however, they are covered by the EMI shield (though both ARE active in the BIOS). The can be disabled to free up an interrupt.
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