However, Hardware Monitoring section didn’t have any parameters to adjust: it performs purely informational function, although doesn’t do it that well: there is not that much really useful info there.
It is interesting that with a 65nm CPU installed, the BIOS shows its real temperature. Or at least close to real. And for a 45nm CPU on Wolfdale core it displays the interval until throttling kicks in, 73ºC in our case.
The most interesting section for overclockers is called Performance:
However, you won’t be able to get to overclocking immediately. At first you have to accept full responsibility for five types of disasters that may happen to you in this case.
And although they give us a hint to answer “No” to the question “Do you wish to continue?”, we confidently click “Yes” and get into Processor Overrides section that looks pretty harmless at first glance.
The mainboard allows changing the processor Vcore from 1.2875V to 1.6V with 0.0125V increment, CPU Voltage Offset raises it even higher, and Enhanced Power Slope ensures additional stability. The FSB voltage can be adjusted by changing the Front Side Bus Voltage Override parameter in the interval from 1.1V to 1.5V with 0.025V increment. The chipset North Bridge voltage can be set using MCH/ICH Voltage Override parameter with the same increment of 0.025V from 1.25V to 1.7V.
Intel DX38BT mainboard allowed changing the processor clock frequency multiplier only for the CPUs with the unlocked one. Intel DX48BT2 doesn’t have this drawback and allows reducing the multiplier below the nominal value to x6 even for regular processors. The FSB frequency changes from 133MHz to 500MHz, so you can forget about overclocking processors with low clock multipliers, because it is very inconvenient to perform, anyway. You could select the voltage from the drop-down menu, however, for the FSB frequency you will have to go up or down the list using “+” or “-“ keys respectively. There is no way to enter the desired value from the keyboard.
However, there will be no need to calculate the resulting frequency, as the Processor Speed information line will display it for you. On the screenshot below the combination of x8 multiplier and 500MHz bus frequency will result into 4GHz processor start speed.
However, it is not quite clear why the mainboard reports that the processor nominal Vcore equals 1.325V, while in reality it is 0.1V lower: 1.225V. I believe that it is not ridiculous, but shameful for an Intel mainboard on an Intel chipset to make such mistakes with Intel processors.
Reference Voltage Override parameter leads to a separate page with additional features:
Intel DX38BT mainboard didn’t have a parameter like that when we tested it, but now I believe it has it, too. The thing is that Intel DX38BT and Intel DX48BT2 differ only by their North Bridge chips. They are so similar that they use the same BIOS versions.