Correct. Getting a Q6600 wont help. What FLserver needs is a CPU with more processing power per core. Q6600 is the same compared to E6300 (relatively speaking), and OC's the same. E8400 OC's a lot more, and is more efficient in comparison (and costs the same).
Just for reference, the CPU usage during server operation is =~ 70%, and that is while the server is full.
Until FLserver turns onto a fully multithreaded app, we will have to stick to that formulae.
(If you find any mistake in my English, please let me know via a PM)
(Really, I speak terrible English, so please, tell me if I make mistakes. I'd like to improve it a bit )