A opção / NOSMARTSCAN
SpeedFan uses standard calls to the OS to access S.M.A.R.T. info. Unfortunately, some drivers do not work fine and cause the whole system to crash when queried the standard way. Such drivers included some from Silicon Image and some others from nVidia (for nForce 4). You will see that every S.M.A.R.T. enabled tool will crash with such drivers. This switch will prevent SpeedFan from accessing S.M.A.R.T.. You will not see any info about your IDE or SATA hard disks.
A opção / NOSUPERIO
The SuperIO chip contains several functionalities. From the keyboard interface, to floppy, serial and parallel ports, power management and so on. Some SuperIO chips also contain hardware monitoring capabilities and/or fan control support. This is the reason why SpeedFan tries to automatically identify them. This works most of the time, but it looks like that some manufacturers are using custom devices and configurations that collide with this detection process. Such manufacturers include DELL (but not all DELL products). If SpeedFan hangs or causes your system to crash, this switch will be a good candidate for a fix.