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Building on the unprecedented power and reliability of the VIA Apollo KT266A, the VIA Apollo KT333 further raises the performance bar on AMD Athlon™ XP and AMD Duron™ processor based systems.

The VIA Apollo KT333 is the first VIA chipset to feature DDR333 memory offering 25% more memory bandwidth to the CPU. Supporting DDR200/266/333 memory and a complete range of 200/266/333MHz Front Side Bus AMD Athlon™ XP and AMD Duron™ processors, the VIA Apollo KT333 provides lightning fast access to the faster system memory enabling stunning performance across the full application range.

The VIA Apollo KT333 is part of the V-MAP family of chipsets, which provides pin compatibility across the full range of VIA DDR products. V-MAP, or VIA Modular Architecture Platform, allows motherboard manufacturers, OEMs, and System Integrators to serve different market segments with a single, unified platform design. This approach speeds time to market and ultimately reduces the price of V-MAP based mainboards. The VIA Apollo KT333 (model number VT8367) is completely pin-compatible the VIA Apollo KT266A (VT8366A) to ensure rapid time to market. It can be paired with a choice of VT8233/VT8233A/VT8233C South Bridges, which are connected through the chipset's high bandwidth V-Link Hub Architecture. Other key features include AGP4X, ATA-100 (ATA-133 in the VT8233A), integrated six channel advanced audio, six USB ports, LPC bus, and integrated 10/100Mbps Ethernet and Home PNA, AC-97 audio, and MC-97 modem.

Features of VIA KT333

North Bridge  
Processor Support AMD Athlon™ XP & AMD Duron™ Processors
Front Side Bus 200/266/333MHz
Memory Support 200/266/333MHz
AGP Support AGP 4X
Memory Type DDR200/266/333 SDRAM
South Bridge VT8233, VT8233C or VT8233A
North/South Bridge Link VIA V-Link (266MB/sec)

AC'97 6 channel audio


VIA 10/100 Ethernet MAC (VT8233 or 8233A)

3Com® (VT8233C)

PCI Devices/Slots

5 slots


ATA 33/66/100

ATA 133 (VT8233A)

USB 4 Ports
I/O Protocols I/O APIC, LPC Super I/0
Power Management ACPI/APM/PCI/PM

Benefits of VIA KT333

Ultra Powerful Performance
The VIA Apollo KT333 features the world's fastest single channel memory controller, designed for exceptionally high performance. Supporting DDR200/266/333 memory, the VIA Apollo KT333 provides lightning fast access to system memory and can reach a peak bandwidth of 2.7GB/sec, 25% greater than the KT266A, enabling the full performance potential of the fastest AMD Athlon™ XP processors to be harnessed.

ATA-133 IDE Interface
ATA-133 FastDrive™, integrated into the VT8233A South Bridge is the fastest IDE interface currently available and meets today's ever increasing data transfer requirements offering shorter access times and greater performance in a huge variety of everyday applications including audio, video & gaming.

The VIA Modular Architecture Platform offers a balance of reliability and flexibility. Reliability comes from using proven, modular components and evolutionary design principles in enabling the VIA Apollo KT333 to share the best characteristics of award winning previous generation products like the VIA Apollo KT266A. Flexibility comes from the North Bridge pin compatible with the KT266A and the industry's best choice of pin compatible VT8233 series South Bridge options enabling a variety of system configurations and price points based on the same mainboard design.

Block Diagram

Key Features

» Supports AMD Duron™ and Athlon™ Socket A processors
» 200/266/333MHz FSB settings
» Support for AGP 2X/4X
» Supports up to 4.0GB DDR200/266/333 SDRAM
» 266MB/sec high bandwidth North/South Bridge V-Link
» Support for Advanced Communications Riser (ACR) Card Standard
» Integrated 6 channel AC-97 Audio
» Integrated MC-97 Modem
» Integrated 10/100 BaseT Ethernet and 1/10Mb HomePNA controller
» Support for ATA 33/66/100
» 6 USB ports, UHCI compliant
» Advanced power management capabilities including ACPI/OnNow and AMD's PowerNow™
» 552-pin BGA VT8366A North Bridge
» 376-pin BGA VT8233 South Bridge


VIA KT333 presentation
The KT333 Is Here
Kelly and Catherine, two of our stars from product marketing, introduce the VIA KT333… » Download video!
VIA KT333 image kit (mixed)

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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