Your BIOS I would imagine would support it, it is still a 95w TDP chip, the Q9550 is actually older (but better) than the Q8200, but I cant make any guarantees. If you do decide to go this route I would make sure your motherboard has the latest BIOS.
VT-x, and VT-d are virtualizations options which may not be turned on by default in the BIOS. If you go into your BIOS now with your Q8200 do you see anything (even greyed out) to enable to disable Virtualization? If you do thats a sure sign that you will be able to enable that if you drop in a Q9550.
You should be able to get a Q9550 on ebay for relatively cheap. (Like 60 bucks), you can re-use your current Heat sink and fan, you will need to reapply thermal past.