Currently Intel handles information only on some of the Original Equipment Manufacturer (OEM) processors, the Intel Core i5-2430m is only available in OEM version, for information on this particular processor you will need to contact the laptop manufacturer so they can provide you comparison information on OEM processors like this one.
Intel currently has some information on the Intel Core i3-2330M located here:
You can find information on i502430M here:
The i5-2430M has 3 GHz maximum Turbo Boost frequency, whcih, I beleive, is true for one core only. Maximum Turbo Boost frequency for 2 cores should be 2.8 GHz, but it's not confirmed. So, the 2430M should have up to 25% better performance when both cores are active, and up to 35% better performance for one core. Real life performance will be lower if a laptop has poor thermal solution, or if there are some bottlenecks in the system (slow GPU while you do a lot of graphics, or slow disk / not enough memory when you need to process huge amounts of data, etc).