http://www.tecchannel.de/hardware/817/8.html

VIAs problem with PCI performance affects motherboards for Intel- and AMD-CPUs alike. VIA only adapts the northbridge to new processors and normally uses the same southbridge for all chipsets of one generation. However, with VIAs new V-Link-Designs, the southbridge also features all of the PCI interface. With our tests, the same PCI problems were found up to the latest southbridge VT8233A. The older chipsets, without V-Link, showed the same effects.