If the Xabre600 shares the same quirks as its predecessor, it probably won't find its way into many enthusiasts' machines, but the new SiS655 Pentium 4 chipset just might. In addition to AGP 8X, Firewire, and USB 2.0, the SiS655 also supports Intel's Hyper-Threading technology, and features a dual-channel DDR333 memory controller. Granite Bay's dual-channel DDR only goes up to DDR266, which gives SiS the edge in the memory bandwidth department.
Waiting for Hammer? SiS has you covered there, too. The SiS755 is slotted as an affordable, high performance chipset for AMD's upcoming Opteron processor, which won't hit until sometime in the first half of next year.