Read other people's story and is it true my 3570k won't be able to handle temps at 4.4ghz ? You all were convincing about 212 evo being a great cooler ,I'm waiting for the cooler to come in a few days so we'll see.
Each chip is a bit different. You may get lucky, or not.
If your case has decent cooling, 4.4 is definitely a possibility.
My take is to accept what you can get without upping the voltage and be happy.
Even at stock, the 3570K is a very fast chip.