Ghost,
Here's the OC steps I'd recommend to anyone trying to overclock their system. First lets find the FSB limitation.
Go to memory page, on Performance Memory Profiles select automatic. Hit enter, then select Manual. This will get you back to a know default state.
Set Reference Frequency to Default
Memory Frequency to 800
On CPU Page
CPu Voltage Override Default
CPu Voltage Offset Disable
Enhanced Power Slope Enable
FSB Voltage 1.2
MCH Voltage 1.25
Processor Multiplier set to 6
Host Clock Frequency set to 266, this is default for your CPU.
Next try out these settings and make sure it boots. It should, cause it's all really conservative. Then start raising your Host Clock Frequency until you find the point it doesn't boot anymore. You should run some stress tests for a few minutes to ensure it's stable.
Now you know your maximum stable FSB speed at default voltage. You can try increasing the FSB Voltage, the MCH Voltage. And pushing the Host Clock Frequency higher. You probably won't see much for gains above FSB voltage ~1.4 and MCH voltage ~1.5. And you want to run the voltage as low as you can to hit the speed you want to hit.
Next find the max CPU Core speed you can run. Keep the Host Clock Frequency you just found and increase the Processor multiplier until the system won't boot anymore. If it boots at 7 for example and not at 8. Set 8, then drop the Host Clock Frequency down say, 50 MHz. Try booting again. Now you can move the Host Clock Frequency up and down until you find the point the max CPU Core speed it will boot at. The Processor page in BIOS will show you can actual Processor Speed. Next try raising the CPU Voltage Override. Before you change it from default note what the Current Processor Voltage is as shown on the bottom of the screen. Raise the Voltage a bit and see if you can raise the Host Clock Frequency.
As you can see, it will take a while to really tune your system and find all the limits. Once you've finished all the steps above you should know your max CPU Speed and max FSB Speed.
Next will be memory, but I'm getting tired of writing at the moment :)
Orthos is a windows program that runs two instances of Prime95. It stresses your CPU and memory and will report if it has errors. It's a good stability test. You should be able to find it with google.
Ok, I found something weird, I think it might be a bug in 1521 BIOS.
I'm using an E8400, it has a 1333 FSB by default. Whenever I select Referency Frequency of 400, it hangs and I can't boot. Even if I load all defaults and just change that one thing. It should work...
Anyone know a BIOS version that this works? Changing the reference frequency to be higher than the default? This might also be causing some of Ghost's headaches.