Increased frequency of Pci-e

All kind time of day.)
Help, pozh-that, to raise frequency Pci-e on the motherboard msi 760gm-p23 fx.
The documentation for the BIOS of this Mat. the Board honored - the desired item is not found. MB makes some veiled count for overclocking?
Don't ask why, don't say that it is not necessary etc, the only advice on the subject, please.