On the A4000D is it necessary or beneficial to have Super Buster rev. 11 instead of rev. 9? Would I be missing anything if I left it at rev. 9?
Necessary, no, beneficial, sometimes. If you don't plan on using any Zorro cards there is no reason to upgrade to Buster 11.
Also is it difficult to upgrade the chip on the board to rev. 11?
No.
