I'm guessing you're not doing FM?
To compare CPU speeds, check this list:
http://www.cpubenchmark.net/cpu_list.php
Look up what you have now, a CPU that has the same speed PER CORE should be able to do the same things. A few remarks:
- If a CPU has Hyperthreading, you need to divide it's reported speed by 1.3.
- Many filters in Stereo Tool will use upto 2 cores if they are available, so a CPU with 2 cores will be able to do more than one with 1 core, if the speed per core (!) is the same. To get the speed per core, divide the reported speed by the number of cores.
Stereo Tool 7.31 (the latest released version) uses a lot less CPU power for the same settings than the version you're using now, and it sounds better too. (And if you use the new features, a LOT better).