Company Products Initiatives Resources Support Other Languages
Print pagePrint page E-mail pageE-mail page

VIA Chipsets

» Home


» Features
» Benefits
» Block Diagram

Comparison Chart

» K7 Series

Download Center

» Press Release
» Presentation
» Image Kit

South Bridge

» VIA VT8237R Plus
» VIA VT8235


This product is available fully ROHS-compliant.

The VIA KT400A takes the AMD Athlon™ XP processor to the summit of system performance with a FastStream64™ memory controller technology, 333MHz Front Side Bus, AGP 8X Graphics, 6-Channel Audio, Serial ATA, ATA-133, USB 2.0 and 8X V-Link chip interconnect.

Building on the success of seven generations of market leading Chipsets for the AMD Athlon™ XP processor, the VIA KT400A boasts a complete set of today's cutting-edge features combined with VIA's ultra efficient FastStream64™ memory controller technology, delivering performance equivalent to or superior than 128-bit solutions. DDR400 memory support, offering 20% more memory bandwidth to the CPU than DDR333, and the fast 200/266/333MHz processor bus, unleash the full power of AMD Athlon™ XP processors, enabling stunning performance across the full spectrum of applications.

In addition, the VIA KT400A supports the very latest I/O technologies including AGP 8X deriving maximum performance from the most powerful graphics processors. 6-Channel surround sound AC'97 audio completes the audio-visual experience offering an integrated high quality sound solution when listening to mp3s, watching movies, or playing the latest games. The KT400A North Bridge is connected to a VT8237R Plus South Bridge through the fast 8X V-link connection at 533MB/s. With two channel native support for Serial ATA in the South Bridge supplying 150MB/s of bandwidth, as well as up to Eight USB 2.0 ports the VT8237R Plus offers the highest possible peripheral performance for professional and home users.

The VT8237R Plus also features support for Parallel ATA-133 devices extending flexibility to the system integrator by allowing for mainstream or value configurations leveraging the existing technology standard. Additional features include a VIA MAC for 10/100Mbps Fast Ethernet, integrated PCI support, and an MC'97 modem. The VIA KT400A also benefits from VIA Hyperion 4in1 Drivers which deliver seamless compatibility with the latest software and hardware.

Features of VIA KT400A

VIA KT400A + VIA VT8237R Plus
VIA KT400A + VIA VT8235
North Bridge    
Processor Support AMD Athlon™ XP AMD Athlon™ XP
Front Side Bus 200/266/333MHz 200/266/333MHz
Memory Bus 266/333/400MHz 266/333/400MHz
Memory Type DDR200/266/333/400 SDRAM DDR200/266/333/400 SDRAM
Max. Memory 4.0GB 4.0GB
South Bridge VIA VT8237R Plus VIA VT8235
North/South Bridge Link 8X V-Link (533MB/sec) 8X V-Link (533MB/sec)

VIA Vinyl™ 6-channel Audio (AC'97 integrated)

VIA Vinyl™ 6-channel Audio (AC'97 integrated)


VIA MAC 10/100 Ethernet

VIA MAC 10/100 Ethernet

Modem MC'97 MC'97
PCI Devices/Slots

6 slots

6 slots

Dual Channel Serial ATA supports 2 SATA devices

SATALite™ interface for two additional SATA devices 4 total)


V-RAID RAID 0, RAID 1, and RAID 0+1* & JBOD (SATA) No
PATA Parallel ATA133 (up to 4 devices) Parallel ATA133 (up to 4 devices)
USB 8 ports 6 ports
I/O Protocols I/O APIC, LPC Super I/0 LPC Super I/0

Benefits of VIA KT400A

FastStream64 Technology
VIA FastStream64™ Technology uses an expanded array of prefetch buffers to reduce latency in the memory controller, extending performance at a lower transistor cost than dual channel implementations. With a 200/266/333MHz processor bus and supporting DDR200/266/333/400 memory, the VIA KT400A provides lightning fast access to system memory and can reach a peak bandwidth of 3.2GB/sec, 25% greater than the KT400, enabling the full performance potential of the fastest AMD Athlon™ XP processors to be harnessed.

A Platform for Next Generation Integrated Audio
The 6-Channel Surround Sound Audio supported in the VT8235 and VT8237R Plus South Bridges, combined with a high quality external Codec like the VIA VT1616 with enhanced driver support, enables a rich, vibrant sound that will enhance the user experience when listening to music, watching movies, or playing games.

Native Serial ATA Support
The VT8237R Plus is the latest in a series of market leading South Bridge chips integrating the latest in I/O innovation like Serial ATA enabling supreme performance in the most Hard Drive intensive tasks.

Unified VIA Hyperion 4in1 Drivers
VIA's unified approach to Chipset drivers has been established for 8 generations of Chipsets, allowing end users to benefit from high performance and seamless compatibility when using any Microsoft Windows®.

* RAID Level 0+1 requires four Serial ATA drives; support for the two additional drives can only be implemented with two external Serial ATA ports enabled through a SATALite PHY.

Block Diagram

Key Features

» Supports AMD Athlon™ XP processors
» 200/266/333MHz FSB settings
» 200/266/333/400MHz System bus settings
» Support for AGP 2X/4X/8X
» Supports up to 4.0GB DDR200/266/333/400 SDRAM
» 8X V-Link 533MB/s high bandwidth North/South Bridge interconnect
» Integrated 6 channel Surround Sound AC-97 Audio
» Integrated MC-97 Modem
» Integrated 10/100 Ethernet MAC
» Support for Serial ATA (up to 4 devices)
» Support for ATA 33/66/100/133 (up to 4 devices)
» Support for USB 2.0, 8 USB ports, UHCI compliant
» Advanced power management capabilities including ACPI/OnNow
» 664-pin BGA VT8377A North Bridge
» 539-pin BGA VT8237R Plus or VT8235CE (pin to pin compatible) South Bridge


VIA K7 Series chipset comparison chart / Download .pdf version
VIA KT400A press release
VIA KT400A presentation
VIA KT400A image kit

Tech Support

If you should have problems or questions setting up or running your VIA product, we offer comprehensive technical support here and you can find the latest device drivers, as well as helpful forums to discuss and solve your problems.

Follow VIA on Facebook Google+ LinkedIn Pinterest Twitter YouTube
 Home » Terms of Use » Privacy » Feedback  » Sitemap  » Contact VIA Copyright©2015 VIA Technologies, Inc.