First of all, he used a different motherboard. Make sure the heatsink is not grounding itself on something. Double check with a voltimeter that the wire is getting constant 12v. Also, maybe you bus multiplier is too high. You need to check what the multiplier is for the DA 533 and then check the 933 bus multiplier. You may need to reconfigure the multiplier resistors. We need a MacTech to chime in.....Mod? Thats your cue.
-maestro