SiS sent us earlier a PR with the official announcement for the Xabre 600, nothing new features-wise really other than faster clock speeds...

Silicon Integrated Systems Corp. today unveiled the latest generation of its Xabre graphics chipsets, the Xabre600. Built with 0.13-micron process technology, the Xabre600 not only inherits the superb features of Xabre400 to support 8X8 (AGP8X and DirectX8.1), but has become a super graphics engine with complete Pro 8X8 features delivered by a built-in hardware optimized Vertexlizer Engine.

Unfortunately the fancy names doesn't seem to do much for the cards, both TechReport (http://www.tech-report.com/reviews/2002q4/sis-xabre600/index.x?pg=1) and Hothardware (http://www.hothardware.com/hh_files/S&V/sis_xabre600.shtml) have write ups showing relatively poor performance even when compared to NVIDIA's MXs.