ChipSet

The ChipSet shown is actually the relevant part of the chipset that is used by SpeedFan to access the SMBus. Sometimes you will find here something like PIIX4E (the good old SouthBridge from Intel BX), some other you'll find here something like SiS735.

The main thing is that if you find something here, then you're motherboard is better supported than if nothing appears :-)

DIMM info

About DIMM INFO. This started as a test to check SMBus functionality. It actually reads (or tries to) info about your RAM. If anything can be read, this should mean that your SMBus has been properly detected and accessed. But, sometimes, you might even see nothing here even if your SMBus is properly accessed. This may happen because either your motherboard does not "publish" those info directly on the SMBus or because your RAM has got a faulty EPROM.

SEND REPORT

The SEND REPORT facility is one of the most useful debugging tools that SpeedFan has got. If you've got something wrong with your SpeedFan, you should use the SEND REPORT facility to send a report. You will be asked for your email address and for your motherboard model.
Your email address is vital if you plan to receive an answer :-)
Here you can find additional info about reporting.

With the report you'll be able to include any text (question, suggestion, blame :-)) you like.

Find SMBus devices

By pressing this button you will be presented a window with another button. Press it to start scanning the SMBus. SpeedFan will simply search for available devices and will do nothing else. This is useful for me to know whether your CLOCK chip or something else is available somewhere on your motherboard.
If you run this function prior to sending a report, its results will be automatically added to the report itself.