v6 and v8 are identical, they're only using different versions (not revisions, mind you) of the chipset. VIA made two different versions of the same KT333 chip, one pin compatible with KT266A and the other pin compatible with KT400. Other than for the chip package, they're identical.
Using that fact, ECS make five different products out of two slightly different versions of the same board layout - a KT266A board (PC-Chips M811), two KT333 boards (K7VTA3 v6 and v8), a KT400 board (L7VTA2) and a KT400A board (M852).
Using that fact, ECS make five different products out of two slightly different versions of the same board layout - a KT266A board (PC-Chips M811), two KT333 boards (K7VTA3 v6 and v8), a KT400 board (L7VTA2) and a KT400A board (M852).