Up to what temperature are some bacteria able to survive?

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Up to what temperature are some bacteria able to survive?
some only survive up to the boiling point of water, others can die at the freezing point. But sciencetist have found bacteria around volcano vents in the ocean where the water is upwards of 300 degrees farenheit. Sciencetist have also done research where they believe that even after a deep impact on the earth (i.e. comets and metorites) where the earths surface temp would be over 5000 degrees and they still survive. The only "proof" has been found in ice glaciers in the Arctic Circle, in salt rocks.