As a side note, my confusion was supported by Microsoft's own support article http://support.microsoft.com/kb/2727880: look at the section about disabling pre/superfecth:
Which clearly indicates that they recomend disabling the services if the OS is actually installed on the SSD (aka the SSD is the only disk in the system) and it will be of no gain to have them enabled for obvious reasons. But an Intel SRT accelerated HDD is another story...