Originally Posted by MindoverMaster
And your CPU has a memory controller in it.
Skt LGA775 cpu's don't have the memory controller built-in.
Overclocking is the art of making your computer run at a faster clock speed than it was sold at. My cpu is sold as a i7 2600K that runs at 3.4GHz but it is overclocked to 5GHz. You can also overclock other components, as well as the cpu, if your system permits it. Most pre-build computers (like Dell, HP, etc...) can not be overclocked. Overclocking can damage your components if done improperly and it voids your warranty, through most companies don't ask (If they don't ask I don't tell).
Your motherboard was made before the extreme X6800 and others were made so it just wasn't designed to support them. A bios flash may work for a better cpu but unless you get a really good deal on a cpu it's probably not worth it. Compared to a more modern cpu the X6800 is still a piece of crap with todays newer software applications and games.