Eva, Nemesis,

Under PC health status in BIOS, it shows "cpu fan fully on if CPUtemp>25C"...turn off if < 25C.,,etc.
Are these temperature values user defineable, or fixed as shown at 25C? If fixed, can user change them in windows using a DFI supplied utility?
Also, where can I find a manual of what the various bios settings do, and exactly what the windows guardian util does.
Finally, If I'm doing 2xSLI can I use slots 1 and 3, and would they be 16x and 8x in that config? I need to have max spacing between my two cards, at least
three empty slots between them.