SiS755 is the first Athlon64 chipset to combine the ability to fix the AGP/PCI frequency with a full implementation of the 800MHz HyperTransport bus. In addition, while using a traditional North/South bridge chipset, SiS uses a 1GHz Mutiol bus between the chips to minimize the North/South bus as a potential bottleneck. The features of the 964 Southbridge are also fully competitive with SATA RAID, ATA133 IDE, 8USB 2.0 ports, integrated 100db Signal-to-Noise 5.1 channel audio, and 10/100 Ethernet. The only things that we might wish for are 100/1000 Ethernet and Firewire, both of which can be added by board manufacturers. On paper, at least, SiS755 appeared to be the best of current Athlon64 chipsets.
Features are one thing, but there is more to high-performance computing that a feature check list. To our surprise, SiS755 also provided the best performance in AnandTech benchmarks of any Athlon64 chipset that we have tested. This applies across the benchmarks, and there does not appear to be a weak area in the performance of the SiS755 Reference Board. Memory Latency is the best we have seen, Content Creation and General Usage are competitive with the best we've seen on A64, gaming sets new highs for A64 performance, and SPECviewperf performance is the best we have seen on an Athlon64. The margin over other Athlon64 chipset boards we have tested is generally small, but it is consistent. SiS755 provides the best performance of any Athlon64 chipset that we have tested, and we are looking forward to evaluating production boards based on the SiS755.