Which One Works Better?

2.66 GHZ or 2.89 GHZ? which one of this works better?
I'm going to buy a PC case to make it a gaming pc. I have my video card. GeForce 290GTS,4GB ram,2.20 GHZ. But, I need more GHZ lol. Which one works better 2.89 or 2.66?

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