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i5 2500k stock fan

What sort of overclock are you thinking about? If it is anywhere near 4.5ghz then do yourself a favour and but an aftermarket one. If you want to stay around 4ghz then it should be ok just keep an eye on temps.

How high you can go on any fan comes down to how "good" a chip you buy which is usually a lotttery unless you know a certain batch has very low voltage requirements. I would think the stock cooler will give unacceptable cooling under extreme stress somewhere around 1.3v. Now some chips will do 4.5 easy on 1.3v some need 1.4v and I wouldn't like to try to keep a chip cool with the stock cooler running 1.4v.

Hope that helped
 
I tried out the stock fan for a month before getting a Coolermaster heat sink/fan. The stock fan was a noisy thing, and I didn't even try overclocking. I wouldn't rely on it -- that's why I got the Coolermaster fan in the first place.
 
I can tell you it didn't on my new build that I put together right before Christmas. At anything over about 4.2 Ghz my 2500k needs to get close to 1.3v, and the temps under full load were close to 80c. At 4.5 they were over 80c. Shut her down fast that time. And this is in a good CoolerMaster case with two front 80mm, a back 80mm, a blowhole vent, and a side 120mm.
 
Don't try. My 2500K went into the 80's at stock clock under handbrake encoding. Get a cheap aftermarket HSF and it'll help you up to 4.5.
 
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