I too have 1.25 MDD that I tried to OC, to 1.5ghz, it did work for about 15 min, then I got the 'warning' that I need to restart my computer.. I would to take the speed down in increments but charts I found are not real clear as they dont show the bit order to resistor placement tho pix do show pll cfg#s. (I got where I did because 1.5g - 10111 didnt leave much room for error) bitsandpieces archive. Id like to try 1.417ghz

Any help on bit order be good, I do understand binary-the chart isnt clear which way MSB-LSB reads, I dont have enuf examples.
MDD in a MacII case, watercooled, temp on cpu block: 92F