Mate, I think I mentioned this in another thread but the speed of your CPU is incorrect, something somewhere is wrong, it should read 2.83Ghz at stock
Your rated FSB should be 1333
Your multiplier should be 8.5
Check your power options in control panel and select the power scheme "always on" it may be that Speedstep is enabled.
Check your BIOS settings as well.
If you are not yet confident with altering your bios settings then please go into the Cell menu options and take a photo if possible.
Before overclocking it is vital that you find out why you CPU is effectively underclocked at the moment.
Why has everyone ignored this and just posted their own efforts?