2801490A : W: 12.0 in. (305 mm) x D: 9.6 in. (244 mm), Industrial ATX Motherboard with LGA 775 (Socket T) for Intel Pentium 4 Processor up to 3.8 GHz, FSB 800 MHz, 2 x DDR PC 333/400 MHz SDRAM DIMM Sockets - Supports up to 2.0 GB SDRAM, Intel 915G and ICH6 Chipsets, Five PCI Slots, One PCI-Express x1 Slot, One PCI-Express x16 Slot, 4 x SATA, 1 x ATA-100, Intel Chipset CRT SVGA, SINGLE Marvell 88E8053 PCI-Express 10/100/1000 GIGA LAN, Four Serial Ports, Supports up to Six USB Ports - Version 2.0, 1 x 8-bit GPIO, AC-97 Audio and Supports Disk On Module Interfaces.
2801490B : Same as 2801490A, but with DUAL Marvell 88E8053 PCI-Express 10/100/1000 GIGA LAN instead of Single
2801490C : Same as 2801490A, but without One PCI-Express x16 Slot
2801490D : Same as 2801490B, but without One PCI-Express x16 Slot