1- Clock speed is not the final determinant of processor performance.
2- Prior to purchasing any cpu, make a list of your commonly used applications
3- Determine Budget, select processor
- Ensure upgrade path if you need to
4- Study benchmarks including that cpu and its most direct competitor
5- Ask previous/current owners
6- Purchase cpu
7- Finally, Never regret. In technology, you are aways making the best decision in a 'frame of time' (sorta like the inertial frame of reference).