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This product is available fully ROHS-compliant.

The VIA Chrome® KM400 Chipset is the next generation integrated graphics chipset for the AMD Athlon™ XP processor. An ultra fast HyperTransport™ link to the CPU, integrated VIA Chrome® 2D/3D graphics, AGP 8X port, 8X V-Link, Serial ATA/RAID, ATA-133 and USB 2.0 combine to make the KM400 a feature rich and scalable chipset for mainstream corporate and consumer desktop systems.

The VIA Chrome® KM400 chipset features the VIA Chrome® 2D/3D graphics core with MPEG-2 acceleration and DuoView™ technology for excellent multimedia performance and complete flexibility on the desktop. The chipset North Bridge exchanges data with the CPU through a flexible and ultra fast Front Side Bus at speeds of up to 333MHz, and features an AGP 8X controller for graphics upgrades. The KM400 also supports a complete range of DDR memory speeds, including DDR200/266/333/400, enabling OEMs and system integrators the opportunity to attack different price points based on the same mainboard platform.

The VIA Chrome® KM400 North Bridge is connected to the new VIA VT8237R Plus South Bridge through a fast 8X V-Link connection. With native support for Serial ATA in the VT8237R Plus, supplying 150MB/s of bandwidth to your hard drive, as well as support for up to eight USB 2.0 ports, the VT8237R Plus offers the highest possible peripheral performance for professional and home users. In SATA mode, the VIA VT8237R Plus also provides multi level RAID support including RAID level 0 for maximum performance, RAID Level 1 for maximum security, RAID level 0+1 and JBOD.

The VIA VT8237R Plus also features support for up to two 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 connectivity, integrated PCI support, 6-channel surround sound AC'97 audio and an MC'97 modem. The VIA Chrome® KM400 also benefits from the advanced unified VIA Hyperion 4-in-1 driver set, delivering seamless compatibility with the latest software and hardware.

Features of VIA KM400

VIA KM400 + VIA VT8237R Plus
VIA KM400 + VIA VT8235
North Bridge    
Processor Support AMD Athlon™ XP
AMD Duron™
AMD Athlon™ XP
AMD Duron™
Front Side Bus 200/266/333MHz 200/266/333MHz
Memory Support 200/266/333MHz 200/266/333MHz
Integrated Graphics VIA Chrome® 2D/3D Graphics with motion compensation
VIA Chrome® 2D/3D Graphics with motion compensation
AGP Support AGP 2X/4X/8X (AGP 3.0) AGP 2X/4X/8X (AGP 3.0)
South Bridge VIA VT8237R Plus VT8233, VT8233C, VT8233A or 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

Parallel ATA133 (up to 4 devices)

Parallel ATA133 (up to 4 devices)

USB2.0 8 Ports

6 Ports

I/O Protocols IO APIC, LPC Super I/O IO APIC, LPC Super I/O

Benefits of VIA KM400

Integrated VIA Chrome® Graphics
The VIA Chrome® KM400 comprises integrated VIA Chrome® 2D/3D graphics optimized for key productivity applications as well as digital video playback through a hardware MPEG-2 accelerator, and features DuoView™ functionality for an extended desktop, making it the perfect chipset for corporate desktops and workstations based on the AMD Athlon™ XP processor.

Market Proven South Bridge Technology
The VIA VT8237R Plus is the latest in a series of market leading South Bridge chips integrating the very latest in I/O innovation, like Serial ATA/RAID, faster than the competition, while maintaining backwards compatibility and rock solid reliability.

Unified Hyperion 4-in-1 Drivers
VIA's unified approach to chipset drivers has been maintained for eight generations of chipsets, allowing end-users to benefit from high performance and seamless compatibility when using any Microsoft Windows® or Linux based operating system.

Block Diagram

Key Features

» Supports AMD Athlon™ XP and AMD Duron™ Processors
» 200/266/333MHz Front Side Bus
» VIA Chrome® 2D/3D Graphics with motion compensation
» Support for AGP 2X/4X/8X
» 8X V-Link 533MB/s High Bandwidth North/South Bridge Interconnect
» Integrated VIA Vinyl 6-channel Surround Sound AC'97 Audio
» Integrated MC'97 Modem
» Integrated 10/100Mbps Fast Ethernet MAC
» Support for Serial ATA/RAID (VT8237R Plus only)
» Support for ATA-33/66/100/133 (up to 2 devices)
» Support for USB 2.0, eight USB ports, UHCI compliant
» Advanced power management capabilities including ACPI/OnNow
» 552-pin HSBGA VIA VT8378 North Bridge
» 539-pin BGA VIA VT8237R Plus or VT8235CE (pin-to-pin compatible) South Bridge


VIA K7 Series chipset comparison chart / Download .pdf version
VIA KM400 press release
VIA KM400 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.

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