Quote Originally Posted by CannibalCorpse
How can I disable NCQ? Do I need to install nVidia's nForce4 SLI (AMD) drivers?
I agree with Soul Assassin... the slowdown is most likely caused by the fact that your system is no longer overclocked. If you were to overclock your system back to 2.6Ghz, I'm sure you'll see the performance go back up.

And if you haven't installed the nForce drivers under whatever OS you are currently running, you'll want to do that ASAP. Not having those drivers installed could also cause performance to drop by a large amount.