iXBT Labs - Computer Hardware in Detail






Leadtek K7N420D (NVIDIA nForce 420-D) Mainboard

One more board from this very famous company is based on the NVIDIA's chipset. We tested a preproduction sample, but it is of very high quality and has a lot of accessories.


  • Package: a standard low-key design;
  • Documentation: a brief installation manual (a full version will ship with production models) in English;
  • Cables: 1 ATA66/100/133 and 1 FDD;
  • Bracket with gold-plated audio-outs (Front, Rear, Center/Bass), Coaxial SPDIF In/Out, TosLink SPDIF In/Out;
  • CD with software including:
    • drivers;
    • Adobe Acrobat Reader;
    • DirectX 8.1;
    • Award WinFlash;
    • Leadtek SpeedGear.

Despite the full-sized ATX form-factor there are some drawbacks in the layout: several connectors are placed in front of the PCI slots and the power connector is between the AGP slot and the back panel, which can create problems in their handling when expansion cards are inserted; and in the lower left-hand corner the connectors and switches are placed too close to each other. It's not difficult to reach jumpers even when the board is already installed. Their functions are shown on the textolite.

The 3-channel switching voltage regulator incorporates 2 capacitors of 2200 uF and 8 of 1500 uF.

The following controllers are integrated:

  • audio controller based on the chipset's capabilities and Avance Logic ALC650 AC'97 codec with a connector for front audio-outs and a bracket for the rear panel;
  • network controller based on the chipset's capabilities supporting 10BaseT/100BaseTX.

Thanks to the Winbond W83627SF-AW I/O controller the board supports (and has connectors for) smart-card readers.

Non-unsoldered connectors: none.

The system monitoring is supported by the Winbond W83627SF-AW chip. What is controlled:

  • processor, memory voltage, +3.3 and +5 V;
  • speed of 3 fans;
  • temperatures of the processor (a built-in sensor) and the board (a built-in sensor).

There are 2 connectors for adjustable connection of fans and 1 for non-adjustable connection.

Brief characteristics of the board: memory slots - 3 DDR SDRAM; expansion slots - AGP/ 4 PCI/ ACR; I/O ports - 1 COM/ LPT/ 2 PS/2/ 6 USB 1.1; dimensions - 305x245 mm.

Adjustment can be carried out with:

jumpers and switches Jumper to clear up the CMOS
Jumpers to choose a channel mode Center/Bass Center/Bass/ Bass/Center
Jumpers to choose a mode of the 5th USB port Onboard/ ACR slot
BIOS based on the 6.00PG version from Phoenix-Award Setup of memory timings + CAS Latency, Memory Timings
Setup of memory frequency + Auto, 200, 266 and 333 MHz
Setup of AGP bus +
Setup of PCI bus -
Changeable scaler of AGP and PCI buses -
Manual assignment of interrupts -
Changeable FSB frequency + Default, 102, 103, 105, 107, 109, 110, 111, 114, 133, 135, 138, 139, 142, 146, 147, 149, 153 and 157 MHz.
NB: when memory is set to 333 MHz you can't change a FSB frequency
Changeable CPU multiplier + x5-x12.5
Changeable core voltage + -0.05, -0.025, +0.025, +0.05, +0.075, +0.1 and +0.125 B relative to the rated value
Changeable memory voltage + +0.1 and +0.2 V relative to the rated value
Changeable chipset voltage -
Changeable AGP bus voltage + +0.1 and +0.2 V relative to the rated value

We used the latest available version of the BIOS of 12/03/02.

Unfortunately, we couldn't test operation of the board with the DDR333 memory because the system worked very unstably. At the rated frequencies the board performs excellently: it is fast enough, offers a good suite of tools for adjusting and overclocking the system, stable and of rather high quality.

Test results:

Write a comment below. No registration needed!

Article navigation:

blog comments powered by Disqus

  Most Popular Reviews More    RSS  

AMD Phenom II X4 955, Phenom II X4 960T, Phenom II X6 1075T, and Intel Pentium G2120, Core i3-3220, Core i5-3330 Processors

Comparing old, cheap solutions from AMD with new, budget offerings from Intel.
February 1, 2013 · Processor Roundups

Inno3D GeForce GTX 670 iChill, Inno3D GeForce GTX 660 Ti Graphics Cards

A couple of mid-range adapters with original cooling systems.
January 30, 2013 · Video cards: NVIDIA GPUs

Creative Sound Blaster X-Fi Surround 5.1

An external X-Fi solution in tests.
September 9, 2008 · Sound Cards

AMD FX-8350 Processor

The first worthwhile Piledriver CPU.
September 11, 2012 · Processors: AMD

Consumed Power, Energy Consumption: Ivy Bridge vs. Sandy Bridge

Trying out the new method.
September 18, 2012 · Processors: Intel
  Latest Reviews More    RSS  

i3DSpeed, September 2013

Retested all graphics cards with the new drivers.
Oct 18, 2013 · 3Digests

i3DSpeed, August 2013

Added new benchmarks: BioShock Infinite and Metro: Last Light.
Sep 06, 2013 · 3Digests

i3DSpeed, July 2013

Added the test results of NVIDIA GeForce GTX 760 and AMD Radeon HD 7730.
Aug 05, 2013 · 3Digests

Gainward GeForce GTX 650 Ti BOOST 2GB Golden Sample Graphics Card

An excellent hybrid of GeForce GTX 650 Ti and GeForce GTX 660.
Jun 24, 2013 · Video cards: NVIDIA GPUs

i3DSpeed, May 2013

Added the test results of NVIDIA GeForce GTX 770/780.
Jun 03, 2013 · 3Digests
  Latest News More    RSS  

Platform  ·  Video  ·  Multimedia  ·  Mobile  ·  Other  ||  About us & Privacy policy  ·  Twitter  ·  Facebook

Copyright © Byrds Research & Publishing, Ltd., 1997–2011. All rights reserved.