on what you're doing
For just regular use as a word processor/web browser, I'm sure the 2.0Ghz will fit your needs and you wouldn't notice any difference.
For gaming, video editing, and the such, the 2.50ghz would probably make a noticeable difference.
Intel(R) Core(TM) 2 Duo Processor T5750 (2.0GHz) vs. Intel(R) Core 2 Duo Processor T9300 (2.50GHz)?
Im going to buy a laptop soon and im looking at the dell vostro or the hp dv6700(intel NOT amd)