The PowerLeap adapter controls the voltage of the cpu thru jumpers. In fact, you need to use one of the plugs from your psu to power the cpu. It does not get it's power from the board (as far as I know).
As for the Softmenu bios options, the only setting that has an effect is the FSB option, and the CPU/AGP ratio (I believe that is what its called). However, the PowerLeap adapter also has the option to control the FSB speed directly on the adapter if for some reason the board does't set the correct fsb for the cpu (the P3 Tualatins run @ 133FSB, while the Celes run @ 100). But the PowerLeaps fsb options are extreamly limited, so its set to "Auto Detect".
And as far as fans, I used this one:
http://www.svcompucycle.com/svcompucycle/newsvcgc3280.html
ARGH! I just looked at the page myself and their on sale!!!
Chit! Oh well. I purchased that h/s with the YS-Tech 48.5CFM 80mm fan. Be aware however, that the fan and h/s will
NOT fit on the BE6 board! You will have to trim some fins on the h/s to allow clearance for the greenie, so a dremel will be very handy. And as far as the fan goes, I made a hole in the side of my case, and also made a duct to get the airflow directly over the h/s. With that setup, the cpu barely goes over the temps of the board.
And yes, thier price is kinda expensive. Hoever, the pin/wire mod isn't too difficult, but from everything I've read, its pretty much hit and miss on wether the cpu will work with your board or not. With the PowerLeap, I figured that at least I would be able to use the cpu on the board without any major worries.
As so far so good. I think being able to slowly raise the fsb speed has allowed the cpu to get "accustomed" to being overclocked without any changes in voltage. I still haven't had a chance to goto 124fsb speed yet today (too busy), but I may do it before I hit the hay.
Cheers.