So I decided to join the Tillamook fun.
Choose a GA-5AX (rev 3.0) for the experiment.
Added the green and the yellow (VCC and L2), set the MB to 2.0v, 66MHz FSB and 3.0 multi.
MB posted, showed "Tillamook 200MHz" on post and Booted into W2K .
CPU-z showed 100MHz and no L2 for some reason.
Rebooted into DOS and ran speedsys, mem graph clearly showed working L2.
Shut down and set multi to 3.5, once again success at 233MHz.
And here is where it went wrong.
Figured that I should probably double check CPU voltage with a multimeter.
I measured 1.5v, which was weird I thought.
And while I was pondering this the system crashed and the now familiar smell of defeat spread around the CPU area.
Turns out that despite my rather overkill insulation of the soldered jumpers the CPU cooler must have added just a tad to much pressure and shorted something.
I must have nudged the CPU cooler ever so slightly while poking around.
Now I curse myself for using a huge FEP32 when just about any cooler would have done.
So I had my fun, it worked for a while and thankfully the motherboard is OK.
The CPU however is not.
But that's OK, its not like they are expensive or rare (yet).