Overclocking is just to much trouble to gain a little more speed.
What level of overclocking?
Minor over-clocking should be fine. For example, I over clocked my old Athlon Thunderbird (AIXA) from 1.133Ghz to 1.333Ghz (via a pencil trick).
I’ll probably over-clock my AthlonXP/nForce2 box later in the year.
The limit isn´t Mhz it´s MB. Ram size not CPU speed.
Depends on the software. Adding more memory has its limits. For example, a PC with 1Gb of RAM will not sufficiently run faster compared to 512Mb equipped PC when running Quake III.