I have my 1.6a at (158 x 16) @ 1.69 volts actual on a epox 4g4a+. That's the max i can get stable, but i see lots of people getting 2.6Ghz average. The cpu was bought on ebay since no more 1.6a processors were being sold and my mobo is refurb, so thats probably a factor. Weird that my mobo has 2 sticks of pc2700 @ 396mhz and it is stable at 158mhz fsb.