I doubt very much that the motherboard will allow over clocking.
Fujitsu use their own MB in that computer, and it is not in their interest to have customers modifying the BIOS and risking warranty claims.
The control + F1 access is used by Gigabyte only I believe.
You may have some success with clockgen, or some other FSB raising software, but without access to voltage settings in the bios the possibilities will be limited.
Over clocking computers built to a price by a big manufacturer is never going to be especially rewarding. All the components used will be specified to work well at their standard configuration, and will not support any significant increase in performance.