I have the same problem. My DG45FC only reports core0 and core1 temp, and HDD temp. No fan speed, or voltages at all.
According to this, there is no solution from intel either:
Edit: actually, you can, according to this post on the above forum:The current version of SpeedFan did not seem to support this board at all. Most of the readings were blank and no amount of tweaking allowed us to initiate manual fan control. Furthermore, [COLOR=green! important][COLOR=green! important]Intel[/color][/color] does not provide any officially supported monitoring programs.
I downloaded the file (the one on the top), and it works well. Not as useful to integrate on a front end, of course, but at least I get the ICH temp and the fan speed, plus voltages. Useful for detecting problems there.Intel uses its own new specification (well, new as in it's been around for longer than the past two years and used primarily on Intel motherboards only) called Quiet System Technology, or QST. They have not released the specs for this mechanism, which depends on the embedded Management Engine, which is itself barely documented. This means that SpeedFan is unlikely to support it any time soon.
You can, however, use Intel's own Desktop Utilities to monitor temperatures and control fan speeds.