VT4000 card was redesingned to fit into the A3000D and A3000T with out having to cut the chassis of the host machine. The BNC connectors can be moved to accomodate the case. Unless the 3000D is crammed full of cards the Power Supply is enough. More power is always better. NewTek didn't offically support OS3.5 or higher with the Toaster software, but I have yet to read about any problems associated. Good luck and have fun.