1.4. System Requirements
To run KDE, you need a Pentium-class computer running at least 100MHz with at least 32MB of memory. To develop KDE software, however, you should have at least 64MB of memory and at least a 200MHz processor. You will find that a 300MHz processor and 128MB of memory is much more comfortable when compiling the software.
If you plan to run KDE on a lower-end machine, I recommend installing binary files that were compiled elsewhere.