I always thought it was common knowledge VIA southbridges were crap. For example, the relatively common audio and data corruption bug: it affected many KT133(A) chipsets and was not caused by the SB Live, nor is it limited to the specific combination of KT133A northbridge + SB Live sound card + 686B southbridge, despite what VIA would have you believe. Furthermore, the various fixes did not eliminate all problems.
If you were wondering, I did not have an SB Live, but rather, an Aureal 8830 based Diamond MX300 card, and I did not have a 686B southbridge, but rather the original 686. Same problem, and no fix despite using various latency patches and 4-in-1 updates. I even used WPCREDIT to try various settings to the southbridge registers to no avail.
And it's not just sound and data corruption problems that affect the VIA southbridges, but VIA IDE controllers have often yielded slower maximal transfer rates. I have seen several tests where a ATA-66 compatible VIA based motherboard maxed out at 45 MB/s, and an ATA-100 compatible VIA based mobo maxing out at 80 MB/s.
"Data-corruption bug hits VIA chipsets"
http://www.theregister.co.uk/content/3/18267.html
"I had hoped some months ago I would never have to write another news piece or article about a difficulty in VIA's chipsets. I had sincerely hoped Darth VIA had passed on into the annals of history. It's not to be, though: tecChannel is reporting that they have received confirmation that VIA chipsets, from the brand-new KT266A all the way back to the venerable MVP3, suffer from a PCI bug..."
http://tech-report.com/onearticle.x/3244
"Perhaps some were too quick to blame Creative for the SBLive! problems a while back. Although the SBLive! demands quite a bit from the PCI bus, it's hardly Creative's fault that VIA can't seem to get data rate of its PCI bus up to par... The problems found, especially with the frequent interruptions of data transfers on the PCI bus of VIA's chipsets, may also be responsible for many of the compatibility issues found with their products in the past... As a consequence, we can currently not recommend VIA chipsets for professional users who demand high performance from their hard drives and think about setting up RAID configurations. This includes video editing, small- and medium-business servers and workstations for graphics- and audio-editing."
http://tech-report.com/onearticle.x/3280
"I'm starting to believe the claims of a problem with the VIA PCI bus, as documented by TecChannel. I believe I know which timer is interrupting the bus, and I know how to disable the timer, but I believe that SoundBlaster audio will suffer if I do. If I'm right, then the problem is as follows. VIA's PCI controller contains an "arbitration" timer that will detect when a PCI device has used the bus too long. This timer should be triggered when another device needs to use the PCI bus. But VIA's timer is being triggered when no other device needs the bus. As a result, no device can continuously use the bus for longer than the length of the timer."
http://tech-report.com/onearticle.x/3303