As reported over at AndroidPolice, Derek Rodriguez, was able to overclock his HTC Thunderbolt to a ridiculous 1.8GHz! He hit a top Quadrant score of 2750 as you can see from the pic above. He made it a point to note that you shouldn't keep your phone at those kind of clock-speeds for extended periods of time and even Tweeted, "you think I’d really let my phone sit at that?"
You may not be able to utilize those kinds of speeds yet, but the future looks fast!
Source: AndroidPolice