|Overclocked or not, DDR2-667 will bottleneck your system. Why didn't you get DDR2-800?|
The theory behind overclocking an AMD system is simple...clock the CPU as high as possible while leaving the rest of the components as close to their default speeds as possible. The easist way is to simply increase the CPU multiplier, but since your CPU is locked from going above 11x, you're gonna have to overclock by increasing the CPU frequency. The problem with that is that any changes to the CPU frequency have a domino effect on all the other frequencies (HT, RAM, PCI-e, PCI, etc), so you have to compensate by changing them as well.
Most of the overclocking will be done using the MB Intelligent Tweaker(M.I.T.) menu:
CPU Clock Ratio = 11x
CPU NorthBridge Freq = auto
CPU Host Clock Control = manual
CPU Frequency (MHz) = 250MHz
PCIE Clock (MHz) = 100MHz
HT Link Frequency = 800MHz
Set Memory Clock = manual
Memory Clock = DDR533
I'm not gonna bother getting into the memory timing settings. You *may* have to increase the CPU voltage to stabilize the overclock though. To do that, set the System Voltage Control to manual, then go to the CPU Voltage Control & bump it up a bit. Try adding 0.025v to the default voltage for starters, then progress in 0.025v increments.
The above settings will run the CPU at 2.75GHz while maintaining the HT bus at 1000MHz (2000MHz DDR), the PCI-e at 100MHz & the RAM should settle in at about DDR2-647 (approx 323MHz). To get the RAM to run as DDR2-667, you'd have to increase the CPU freq to about 257MHz....that will put the CPU at 2.83GHz with the HT bus at 1028MHz.
Get yourself some DDR2-800 RAM ASAP. When you do, all you have to do is change the memory clock to DDR667 & it will run as DDR2-784 (approx 196MHz)...that's with the CPU freq at 250MHz. Bump the freq up to 255MHz & the RAM will run as DDR2-800, the CPU at 2.8GHz & HT bus at 1020MHz.
Here's 4GB (2 x 2GB) of Corsair for just $30:
Here's the same RAM at Frys.com for just $15 but it's currently out of stock. You may wanna keep your eye on it & order when it comes in: