Sensor Locations on B75M DGS R2.0 Motherboard?

Hello all,

Does anyone know where the CPU and Motherboard (chassis) sensors are located on the B75M DGS R2.0 motherboard? Any help in identifying the locations would be greatly appreciated. I have attached two pictures for your reference:

Thank you,

gustavio










Edited by gustavio - 31 Mar 2016 at 5:20am

The single "mother board" temperature sensor location is one of the great mysteries of any mother board.

Mother board manufactures have given us this lone temperature reading for many years, without explaining what significance it has.

I am not aware of any mother board's manual or monitoring program that gives the location of the single "mother board" temperature sensor on their products. That includes your board, I have no idea where it is, or where it is on any of the mother boards I use now or in the past.

There are a few boards such as the ASRock OC Formula series that have multiple (~10) temperature sensors located at various places on the board. The monitoring program ASRock provides for these boards has a display that shows the location of the sensors, and their temperature readings. This display does not include the "mother board" temperature.

Once you use a mother board like those I described above (which I have), you understand that the value of one mother board temperature reading is small. Add to that the unknown location of that sensor, and its value becomes even less IMO.

You referred to the mother board temperature sensor as a "chassis" sensor, which is confusing. Usually the PC's chassis is the PC case that contains all the parts of a PC. The term "chassis fans" normally mean fans mounted on the PC case, and the "chassis fan" headers on a mother board are the connections we can use with those fans. Where do you see anything labeled as a "chassis" temperature?

Intel and AMD have different ways of providing CPU temperature data, and I'll only be talking about Intel's methods here.

An Intel processor has multiple temperature sensors built into it, and the methods for reading that data are provided by Intel. We normally have a temperature for each processor core in the CPU. Your Pentium G2020 has two cores, and it should provide two core temperature readings.

An Intel processor may also provide a "package" temperature, as well as a "graphics core" temperature. These sensors are also part of the processor itself, they are not sensors added by the mother board manufacture.

If an Intel mother board has an added CPU socket temperature sensor, its value is questionable, since Intel uses the internal sensors it built into the processor to determine if it is over heating and should be shut off to prevent damage. A socket temperature sensor reading will likely be less than the true internal temperature of the processor, and really provides little useful information.

Mother board monitoring programs like Speccy are designed to work with all the different mother boards that we may be using, as well as being made for Intel or AMD processors. That is a difficult task, since all mother boards are not the same, and there are few standards about what sensor reading belongs to which sensor.

Speccy is very generic and simple with its temperature readings. Its "Motherboard (CPUSocket)" reading has two different terms combined into one, which IMO does not make sense. AMD boards tend to have a CPU Socket temperature reading, but it certainly is not the mother board temperature.

Matching temperature values as you did is the only way to know what the Speccy reading really is.

The only value I find in the single mother board temperature is if it changes significantly or reaches 30C.

Edited by gustavio - 31 Mar 2016 at 11:42am