KT400 was expected by AMD fans because VIA promised a superior performance, closer to Intel’s imposed new barrier. From the technical point of view we can hardly see AMD Athlon as a solution able to face Pentium 4. But we have to appreciate that AMD has done everything possible to maintain their processors' performance at a decent level while keeping their prices down. Although the new Athlons are manufactured in 0.13 micron technology it seems that there are no many resources left for AMD to increase clock speeds. The bus speed is an important factor in a CPU overall performance that's why the latest Athlon processors run at a 333Mhz bus, which means that the memory bus is now synchronized with the FSB, so you will experience lower latencies and you will be able to overclock better. The new KT400 "officially” supports 333Mhz FSB, one of the reasons why the chipset was so expected. The first review of a KT400 based motherboard will be done using an Abit motherboard, a successor of the Abit AT7 MAX.
Review Link : PCHardware