Welcome to TechIMO
teposen1.
First of all you need to get your system running stable at stock speed before you try to overclock anything.
The 2600+ comes in 2 flavours:
1. 266MHz fsb = 2133MHz clock speed
2. 333MHz fsb = 2083MHz clock speed
neither has a Barton core ...which has 512Kb L2 cache compared to your 256Kb!
The label will tell you which you have when you check it at the
AMD website! Do this before you go any further ...if you heat it up to much thru inadvertant overclocking you may void the warrenty.