Mainboard AB45

• Chipset
  Intel 845E Chipset
  Memory Controller Hub (MCH): Intel 82845E with passive cooler installed
  I/O Controller Hub (ICH4): Intel 82801DB
  BUS: 100/133MHz
• Socket 478 CPU support
  Intel Pentium 4  for Socket 478 (Willamette or Northwood) and P4 Celeron
  with 400 and 533MHz FSB (100 and 133MHz BUS, Quad-Datarate process)
  successfully tested with: P4 Celeron up to 1,8 GHz, P4 (Willamette 256KB Cache) up to 2,2GHz,
  P4 (Northwood 400MHz FSB) up to 2,4GHz and P4 (Northwood 533MHz FSB) up to 2,8GHz
  Mainboard supports Hyper-Threading
  FSB infinitely adjustable: 100...166MHz (in 1 MHz steps)
  CPU multiplier automatic, or adjustable from 8 up to 50x
• Expansion slots
  1 x AGP (v2.0) slot supports 4X mode
  5 x 32 Bit PCI (v2.2)
  Important note: AGP slot supports only 1,5V mode (see below)
• Onboard IDE Controller
  2 Channel Enhanced PCI IDE
  for up to 4 IDE devices
  supports UltraDMA/100
• Integrated Multi Channel AC'97 Audio Function:
  conforming to AC'97 v2.2 specification
  supports 6 channel speaker mode
  Connectors on the backpanel: line-in, line-out, microphone, MIDI/gameport, line in/out
  Connector on the bracket: for bass/center, bracket included in delivery
  In Multi Channel operation: line-out = in front, line-in = rear and onboard connector "CN13" for bass/center
  More line-ins on the mainboard audio-in for CD-ROM (connectors CN4 and CN12) and AUX (CN11). 
• Backpanel connectors
  1 x PS/2 Mouse
  1 x PS/2 Keyboard
  1 x Parallel (SSP/EPP/ECP)
  2 x Serial (16550 compatible, Fifo)
  2 x USB 2.0 (4 further onboard)
  Audio: line-in, line-out, microphone, MIDI/gameport
• Onboard connectors
  1 x Floppy drive (up to 2,88 MB)
  4 x USB 2.0 (two further on backpanel)
  1 x Infrared (COM2 can be used for infrared communication, IrDA-adapter not included in delivery)
  1 x WOL (Wake on Lan)
  1 x SPDIF (electric)
  2 x Audio frontpanel-connectors (microphone and line-out)
  1 x Bass/Center Audio-out 
  2 x CDROM Audio-in
  1 x Audio (AUX)
  3 x Fan (CPU, AGP, Case)
• Memory
  2 x 184-Pin DIMM-Socket
  for PC1600 oder PC2100 unbuffered DDR SDRAM memory
  with 100 or 133MHz clock frequency up to 2GB capacity
• Hardware monitoring
  CPU temperature, voltages and fan revolution
• Power Management
  ACPI version 1.0 (Advanced Configuration and Power Interface)
  supports power saving modes: S1 (Snoop), S3 (Suspend to RAM), S4 (Suspend to DISK), S5 (Soft-Off)
  On/Off button with two functions: Suspend-mode / soft off
  Power on after power failure
• BIOS
  Award V6.0PG  PnP Green BIOS
  stored in 4MBit LPC Flash memory chip
• ATX power supply connector
  Standard 20-Pin-ATX power supply connector

• Form Factor
  ATX: 30,5 x 19 cm

The version marking can be found next to the outermost PCI slot or on the package:

Version 2.1 has an additional 12V plug for the power supply and requires also another BIOS version.