So I replaced the powersupply and got a dual 1.42 module for my MDD, but after I install it, apple system profiler reads it as dual 417 mhz. Is the cpu bad or something? after just a few minutes of use it kernel panics. I thought it might be a heat issue, but I did apply thermal grease and temperature (4.11) shows that the cpu board is running at 45-50 degrees.

Is this a bad cpu? Or is it still a heat issue? When I touch the copper heatsink (got this too), it's pretty warm considering it's running at 417mhz