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The UP2000 and UP2000+ are motherboards produced by API NetWorks which featured the Tsunami chipset and a Slot B processor interface.

The UP2000 is the first motherboard to be built by API NetWorks and was released in 1999.

• 1-2 667 MHz EV67 CPUs with 2/4MB external L2 cache or 750 MHz EV67 CPUs with 4/8MB external L2 cache ¹⁾
• Tsunami chipset (1x Cchip, 4x Dchips, 2x Pchips)
• 8x 168 pin DIMMs, supports 64 MB to 2GB of ECC Registered RAM (2.67 GB/s)
• 256-bit memory bus running at 83 MHz
• 64-bit 33 MHz PCI Bus with 2x 64-bit 33 MHz PCI slots and 1 32-bit 33 MHz slot
• 32-bit 33 MHz PCI Bus with 3x PCI slots
• AIC-7891 SCSI

The UP2000+ is a minor update to the UP2000. It contains only a few changes, noted below. Otherwise, all the hardware is the same.

A feature added to the UP2000+ was the ability to automatically detect the frequency of the CPUs, whereas the UP2000 required jumpered configuration. ²⁾

• 1-2 833 MHz EV68AL CPUs with 4/8MB external L2 cache (in addition to CPUs supported by UP2000) ³⁾
• 2x 64-bit 33 MHz PCI Buses
  • 3x 64-bit Slots on bus 0
  • 1x 64-bit and 2x 32-bit slots on bus 1