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It is possible for your framerate to be higher than your tickrate. Ticks will not occur more than 66 times per second regardless of framerate.
What you're seeing is tversity starting up high resolution timer which is a gobal Windows setting. Since it's global, srcds's built-in sleeps between frames become much shorter. It's the same reason srcdsfpsboost works.
http://msdn.microsoft.com/en-us/library/dd757624(VS.85).aspx