This will be of interest to all those who poesies chipset from VIA. So I like Posit.

Maybe not what you know or what that choice is made with each configuration. I will try to explain it as simply as possible.
The V-Link is a specific VIA bus, a bus bridge between the north and south bridge chipset. The main option is the configuration possibilities:
Mode 0: The bus operates in QDR (Quad Data Rate, quadruple ratio data) with 8 data lines. Bandwidth with this option is 266MB / s.
Mode 1 and 2: The bus will run on ODR (Octal Data Rate, octal data ratio) with 8 data lines. The bandwidth is 533MB / s.
Mode 3: The bus will operate in 16 QDR with data lines. In bandwidth are 533MB / s.
Mode 4: The bus will run on ODR with 16 data lines. The bandwidth is therefore of 1GB / s.
Auto: The BIOS chooses the best (usually the 4th).

There are a couple of secondary options:
V-Link Data 2X Support: This option is only available if enabled and the Serial ATA controller will only use it if there is also a Serial ATA hard drive. Activated, it makes the SATA controller to enter into direct communication with the chipset through the V-Link bus. Off, the controller will communicate through the PCI bus.
8X V-Link Support: usually only to set the mode to automatic. This option doubles the data rate. That is, if maintaining the bus frequency, for example, 66 MHz, and being turned off this option, the bus would operate on QDR having a bandwidth of 266MB / s. but when activated, operate in ODR having a bandwidth of 533MB / s.