For most home users, there will be no tangible benefit from Native Command Queuing. While benchmarks may look nice, our real-world tests said otherwise. That is not to say that NCQ is useless altogether, but for the majority of desktop computers, you're not going to see a performance gain as you would with a jump to a newer processor. However, in situations when Hyper-Threading is being tapped, we saw some improvement in the results that would not be seen without a major hardware upgrade.



Link: Viper's Lair