site is kind of slow, so I pasted what was said.
http://www.amdboard.com/kt400a_preview.html
7th Generation Socket A Chipset From VIA
VIA FastStream64? Technology Maximizes Performance with the new AMD Athlon XP 3000+ CPU, and leaves nForce2 trailing
AGP 8X with VIA Hyperion 4in1 Drivers For Maximum Frame Rates in Doom ?III? Generation Games
First to Market Native Serial ATA support in the VT8237 South Bridge
VIA TidalWave Onboard Audio For Surround Gaming
DualDDR: Cost Without Benefit
AMD 333MHz FSB is maxed out at 2.7GB/s, equivalent to the maximum theoretical bandwidth in a single channel DDR333 configuration
Dual DDR configurations for the AMD Athlon? XP are overkill and needlessly raise the cost of the platform
The key to performance is the efficiency of the North Bridge memory controller and CPU interface
FastStream64? Technology
FastStream64? Technology enables the single channel 64-bit memory controller of the KT400A to out perform the Nforce2 Chipset in 128-bit mode
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
KT400A is designed to maximize performance in both synchronous (DDR333/333MHz FSB) & asynchronous (DDR400/333MHz FSB) modes
KT400A North Bridge Summary
Leading Edge Performance Features
200/266/333MHz Front Side Bus
Ultra-fast FastStream64 Memory Controller with 200/266/333/400MHz system bus
Support for up to 4GB High-Speed DDR200/266/333/400 SDRAM
8X V-Link Architecture
- Peak bandwidth of 533MB/s
AGP 8X with 2.1GB/s of dedicated bandwidth for the GPU
Supports full range of Socket A 462-pin AMD Athlon? XP processors including the new ?Barton? core CPU?s
VIA TidalWave Onboard Audio
Full support for the latest surround sound games:
Don?t get taken from behind
VT1616 Codec solution in combination with VT8235/8237 SB with Sensaura Drivers
Higher Quality and Fidelity Than Nforce2 mainboards featuring inferior codec solutions
DualMax -- hardware downmixing technology
CoolAmp ? reduced heat for consistent performance
Serial ATA - Native Support in Q2
First to market native Serial ATA support in the VT8237 will finally realise performance potential of 150MB/s interface
Bypasses PCI Bus and flies straight to the 533MB/s 8X V-link Chip Interconnect superior performance in the most data intensive applications
VT6420 - Full specs here
1st Combined SATA, PATA & RAID Controller
Supports 2 channels for up to 4 SATA Devices
Supports 1 channel for up to 2 PATA Devices
Supports RAID Levels 0,2,0+1 & JBOD
SATAlite Interface allowing 2 additional channels with external phy
Tiny 15mm BGA package
VT8237
Supports up to 4 SATA Devices
Supports up to PATA Devices
Supports 8 X USB 2.0
Supports 8X (533MB/s) & Ultra (1.06GB/s) V-Link Chip Interconnect
Pin compatible with VT8235CE for simple mainboard upgrade
VIA Modular Architecture Platform
V-MAP
- Pin-to-Pin Compatible South Bridge options
- Drop-in North Bridge replacement for KT400
Seamless product transitions on a single motherboard platform
- Faster Time to Market
- Lower Product Development, Validation, and Production costs
KT400A + VT8235CE
VIA FastStream? Technology
DDR266/333/400 Support
333MHz FSB
AGP 8X
8X V-Link
USB 2.0
ATA-133
10/100 Fast Ethernet
6-ch. AC?97 Audio
VT8235
High Degree of Integration
8X V-Link
USB 2.0
VIA Ethernet MAC
ATA 133
6 Channel Audio
MC?97 Modem
LPC
PCI Controller
KT400A + VT8237
VIA FastStream Technology
DDR266/333/400
Support 333MHz FSB
AGP 8X
8X V-Link
USB 2.0
SATA
ATA-133
10/100 Fast Ethernet
6-ch. AC?97 Audio
]
http://www.amdboard.com/kt400a_preview.html
7th Generation Socket A Chipset From VIA
VIA FastStream64? Technology Maximizes Performance with the new AMD Athlon XP 3000+ CPU, and leaves nForce2 trailing
AGP 8X with VIA Hyperion 4in1 Drivers For Maximum Frame Rates in Doom ?III? Generation Games
First to Market Native Serial ATA support in the VT8237 South Bridge
VIA TidalWave Onboard Audio For Surround Gaming
DualDDR: Cost Without Benefit
AMD 333MHz FSB is maxed out at 2.7GB/s, equivalent to the maximum theoretical bandwidth in a single channel DDR333 configuration
Dual DDR configurations for the AMD Athlon? XP are overkill and needlessly raise the cost of the platform
The key to performance is the efficiency of the North Bridge memory controller and CPU interface
FastStream64? Technology
FastStream64? Technology enables the single channel 64-bit memory controller of the KT400A to out perform the Nforce2 Chipset in 128-bit mode
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
KT400A is designed to maximize performance in both synchronous (DDR333/333MHz FSB) & asynchronous (DDR400/333MHz FSB) modes
KT400A North Bridge Summary
Leading Edge Performance Features
200/266/333MHz Front Side Bus
Ultra-fast FastStream64 Memory Controller with 200/266/333/400MHz system bus
Support for up to 4GB High-Speed DDR200/266/333/400 SDRAM
8X V-Link Architecture
- Peak bandwidth of 533MB/s
AGP 8X with 2.1GB/s of dedicated bandwidth for the GPU
Supports full range of Socket A 462-pin AMD Athlon? XP processors including the new ?Barton? core CPU?s
VIA TidalWave Onboard Audio
Full support for the latest surround sound games:
Don?t get taken from behind
VT1616 Codec solution in combination with VT8235/8237 SB with Sensaura Drivers
Higher Quality and Fidelity Than Nforce2 mainboards featuring inferior codec solutions
DualMax -- hardware downmixing technology
CoolAmp ? reduced heat for consistent performance
Serial ATA - Native Support in Q2
First to market native Serial ATA support in the VT8237 will finally realise performance potential of 150MB/s interface
Bypasses PCI Bus and flies straight to the 533MB/s 8X V-link Chip Interconnect superior performance in the most data intensive applications
VT6420 - Full specs here
1st Combined SATA, PATA & RAID Controller
Supports 2 channels for up to 4 SATA Devices
Supports 1 channel for up to 2 PATA Devices
Supports RAID Levels 0,2,0+1 & JBOD
SATAlite Interface allowing 2 additional channels with external phy
Tiny 15mm BGA package
VT8237
Supports up to 4 SATA Devices
Supports up to PATA Devices
Supports 8 X USB 2.0
Supports 8X (533MB/s) & Ultra (1.06GB/s) V-Link Chip Interconnect
Pin compatible with VT8235CE for simple mainboard upgrade
VIA Modular Architecture Platform
V-MAP
- Pin-to-Pin Compatible South Bridge options
- Drop-in North Bridge replacement for KT400
Seamless product transitions on a single motherboard platform
- Faster Time to Market
- Lower Product Development, Validation, and Production costs
KT400A + VT8235CE
VIA FastStream? Technology
DDR266/333/400 Support
333MHz FSB
AGP 8X
8X V-Link
USB 2.0
ATA-133
10/100 Fast Ethernet
6-ch. AC?97 Audio
VT8235
High Degree of Integration
8X V-Link
USB 2.0
VIA Ethernet MAC
ATA 133
6 Channel Audio
MC?97 Modem
LPC
PCI Controller
KT400A + VT8237
VIA FastStream Technology
DDR266/333/400
Support 333MHz FSB
AGP 8X
8X V-Link
USB 2.0
SATA
ATA-133
10/100 Fast Ethernet
6-ch. AC?97 Audio
]