At least with the AMD 67X0 models of the MBP the problem isn't the chip itself, but the solder connection (or lack thereof). Same issue as the XBOX 360 RROD. So

At least with the AMD 67X0 models of the MBP the problem isn't the chip itself, but the solder connection (or lack thereof). Same issue as the XBOX 360 RROD. So just replacing from lead free solder to lead solder does the trick.