When the T-Mobile G2 came out, it packed good features, like HSPA+. However, the processor was a shame, only 800 GHz. The last time, the G2 got Overclocked up to 1.4 GHz, now, thanks always to the team of XDA Developers, a user could Overclocked the G2 up to 1.9 GHz. According with XDA, the processor not only increased more than 100% capacity, but also it is stable reaching 2700 and 2800 in Quadrant and 55-60 in Linpack.
If you wanna try it, fallow this instruction Here