NVIDIA AND VIA HAVE dominated the enthusiast market for Athlon 64 chipsets, but they're not the only ones with core logic for AMD's latest processors. SiS has quietly been churning out the SiS755 chipset, which is seeing a lot of action in inexpensive Socket 754 boards from ECS, ASRock, and Foxconn. Can the chipset's features and performance keep up with its Athlon 64 competition? We tested a SiS755 board against VIA's K8T800 and NVIDIA's nForce3 150 and 250Gb chipsets to find out.