Here what I know so far, our boards work in a GX620 okay we have Dell (Case #185689938) working on the same issue. The Optiplex 330 uses Intel G31Express Chipset w/ ICH7R, it is what I have been told. Is there Intel Chip Set Legacy Issue when trying to use certain PCI cards with newer Dells that have the latest chip sets?
There have been times where I have seen some brands of cards that just won't work with certain MB's. I have seen this on Dell MB's, and retail versions of the board. As for the chipset, if one is not listed on our support site, I suggest going to the Intel site and look for the update. Also, you might want to post on the workstation/optiplex board. Someone there might have seen this before.