Are there any differences between those 2? I just tried the voltage tweak to make my brand new G4 ZIF 400 run at 500mhz but it failed. The machine freezes a few seconds after boot, or during it, sometimes with bomb error messages. I followed exactly this: http://xlr8yourmac.com/G4ZONE/G4YIKESOC/500MHz_yikes.html

but it failed. However I succeeded with a G4 zif 350 to run at 450mhz with the same voltage tweak.

Could it be because the B&W has a different heatsink from the "Yikes!"? Mine is a B&W using the G4 zif module from a Yikes. Any help is appreciated.

Regards,

Filipe

PS.: I already have extra cooling added (2 additional fans attached to the heatsink and thermal grease)