Hmm, i dont know about the clock speed - i`ve seen it slowing down when CPU was throttled improperly, but never seen it working too fast so i cant help here.

But about the dmg images - if you have updated to 10.5.6 as you said, you have to use Seatbelt.kext for 10.5.6 or else you might have problems with mounting images and usb drives. Give it a try.

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