I though I would have to increase the motherboard FSB first to then be able to increase CPU frequency to get a CPU bus speed minor or equal to mobo FSB.

I think I'm wrong because increasing CPU MHz automatically increases mobo FSB.

Also motherboard is compatible 1066MHz and after 13% CPU oc'ing I get a 1204MHz FSB value and everything runs well (not better though).

I think I need some explainations. Would you please help me to understand the relations and actions between mobo FSB and CPU bus speed.

Thanks a lot!

GigaByte 3D Aurora
Asus P5WDHDeluxe RAID 0
Intel Core 2 Duo E6700
2GB DDR2 Twin2X 800MHz
nVidia GeForce 7900 GTX

They're basically the same thing, but it's much less confusing if you refer to them as they're actual clock settings, rather than the double-pumped or quad-pumped numbers.

For Intel CPUs:

533MHz FSB = 133MHz
800MHz FSB = 200MHz
1066MHz FSB = 266MHz
1333MHz FSB = 333MHz

For RAM:

DDR266 = 133MHz
DDR333 = 166MHz
DDR400 = 200MHz
DDR2-533 = 266MHz
DDR2-667 = 333MHz
DDR2-800 = 400MHz

You should always strive for a 1:1 CPU:DRAM ratio. If you have an Intel 1066MHz FSB CPU, your RAM should run at 266MHz. So if you have DDR2-667 or DDR2-800, you should change the RAM settings in the BIOS to match the CPU freq of 266MHz.

You've increased the CPU freq from 266MHz to 301MHz, therefore your RAM should also be set to run at 301MHz.

Thanks for your answer.

Yes BIOS turned RAM speed automatically to the 1:1 ratio right to 301MHz.

How can I be sure that the other components such as DVD writer won't take disadvantage from the FSB increase?

GigaByte 3D Aurora
Asus P5WDHDeluxe RAID 0
Intel Core 2 Duo E6700
2GB DDR2 Twin2X 800MHz
nVidia GeForce 7900 GTX

Sorry for double post, I forgot to mention I stuck the PCI and PCI-express speed to 33 & 100 MHz.

GigaByte 3D Aurora
Asus P5WDHDeluxe RAID 0
Intel Core 2 Duo E6700
2GB DDR2 Twin2X 800MHz
nVidia GeForce 7900 GTX