If it's any help, I've got some PDFs of the manual, which has jumper setting details. Briefly though, three sets of jumpers need to be altered for a K6 2/500, the first set is to make the bus multiplier to 5x: JP3 pins 2-3 set
JP4 pins 2-3 set JP5 pins 1-2 set I'd imagine this would be the same for a K6 3/500 too. The next set are for the voltage, which is 2.2v for a...