If you don't intend to use the drive then I would not put it in the computer. If you do want to put it in the computer then I would just mount it and not plug cables into it.
You open yourself to unnecessary downside by plugging in the drive when you aren't using it.
I am not an expert on the V8, but if it says it works with AM3 then it probably does.
I am not a big fan of the OCZ brand but some people here with respected opinions swear by it.
If it were me, I would buy an AM3 board to go with a new Phenom 2 x4 processor (indeed my board is AM3+ and my processor is Phenom 2 x4). Some backward compatibility is there, but the motherboard is the most important part of a PC in most respects.