Being upside down shouldn't have an effect on heatpipes, they work using a "wick" inside the pipe, so gravity isn't an issue.
If you've got the original
BIOS then more than likely you will have problems with that memory until it's flashed. You could buy different memory, ask DFI for a new
BIOS chip, or purchase a pre-programmed
BIOS chip off the net. Any of those should work.
I couldn't help you with the Q9450 mate, sorry! I'm having enough trouble keeping a QX9650 stable at 400fsb, I have a week off work now though, so I can get stuck in with tweaking
GTL ref voltages, I'm sure I should be able to get it stable at some point :P