iXBT Labs - Computer Hardware in Detail






Acorp 7NFU400 (NVIDIA nForce2 Ultra 400) Mainboard

This board has no "frills" at all: it offers minimal functionality and an OEM accessory pack. Some may like it: why to pay for unnecessary controllers, cables and brackets if you don't need them?

The board is pretty small, and this fact usually affects the layout: it can be difficult to reach some jumpers when the board is already installed, and their functions are not indicated on the PCB. The 2-phase switching voltage regulator incorporates 3 capacitors of 2200 uF and 5 of 1500 uF. There are also voltage regulators of the AGP bus (2 1000 uF and several less capacious) and of the memory (1 of 1500 uF). 

Connectors which are left space for: PHY controller of the network adapter and RJ45 connector, D-SUB connector. The board measures 305x210 mm (narrowed ATX, 6 fastening screws, the board's edge with DIMM connectors hangs unfastened). System monitoring is supported by Winbond W83627THF-AW chip. It controls: 

  • processor, AGP bus voltages: +3.3, +-5 and +-12 V, VBAT and +5 V Standby
  • rotation speed of 3 fans; 
  • temperatures of the processor (socket's sensor) and the board (built-in sensor) 

Ports & connectors onboard

  • CPU socket (Socket A/Socket 462);
  • 3 slots for DDR SDRAM DIMM (one pair painted a distinguishable color);
  • AGP slot (not Pro, with a retention clip);
  • 5 PCI slots (32bit, 33MHz);
  • 1 CNR;
  • Power supply connector: standard ATX;
  • FDD;
  • 2 IDE (Parallel ATA) - on chipset;
  • Connector for bracket with 2 additional USB (2.0) ports;
  • Connector for Game port;
  • Connector for standard IR module;
  • Connector for audio-out from CD/DVD drive;
  • Wake-On-LAN;
  • 3 fan connectors (2 with rotation control, 1 without it).

Rear panel (left to right, in units)

  • PS/2 ports for keyboard & mouse;
  • 1 LPT and 2 COM ports;
  • 2 USB (2.0);
  • 2 USB (2.0) more;
  • 3 audio connectors (Line In/Out and Microphone).

The board is meant for a budget-minded customer who doesn't strive for high functionality and all-in-one solutions. 


  • Documentation: user manual in English;
  • Cables: 1 ATA66/100/133 and 1 FDD;
  • I/O Shield.

Integrated controllers

  • audio controller based on the Realtek ALC655 AC'97 codec; 5.1 audio system supported, front audio I/O connector provided.


jumpers and switches CMOS clear jumper  
CPU bus clock selection jumper Auto, 100 MHz
Jumper for starting up PC from PS/2 keyboard  
BIOS based on Award v6.00PG Setup of memory timings + CAS Latency, T(RAS), T(RCD), T(RP)
Setup of memory frequency + By SPD, 75, 80, 83, 100, 120, 125, 133, 150, 166% of FSB clock speeds
Setup of AGP bus -  
Setup of PCI bus -  
AGP/PCI frequency setup -  
PCI IRQ manual assignment -  
FSB frequency setup + 100, 133, 166, 200, 236, 240, 242, 244, 245, 250 MHz
CPU clock ratio + x8-x24
CPU voltage control + 1.1-1.85 V in 0.025V steps
DIMM voltage control + 2.5-3.0 V in 0.1 steps
NB voltage control + 1.6, 1.7 V
AGP voltage control + 1.5, 1.6, 1.7 V

We used the BIOS of 10.07.03 as the latest available version. 

Test results: 


Dmitry Mayorov (destrax@ixbt.com)
Vladimir Rybnikov (puree@ixbt.com)

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