I would say that the bios options of the Lenovo M58 will be very basic indeed.
And as said it is likely even if you wanted to overclock your cpu .
You will have little or no advanced bios options to be available to do so on your Lenovo M58 thinkcenter .
overclocking is the last thing on the list when it comes to pre built systems, and custom system motherboards. with laptops and tower based systems by a vendor where they are a pre built affair.
Cutting the options, using a cheaper motherboard and a limited bios with limited feature setup options of it are the order of the day to gain more profit from the sale of the pre built system.