Simply put each processor is different they all meet the minimum specifications to run at 1Ghz in the droid 2 but some are better than others and can run at higher clock speeds. Its all about quality since the processor chips are mass produced on wafers.
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1.)http://www.droidforums.net/forum/re...-dummies-guide-android-terminoligy-lingo.html
2.)http://www.droidforums.net/forum/rescue-squad-guides/70875-what-you-need-know-about-rooting.html
3.)http://www.droidforums.net/forum/re...08-multiple-phones-root-them-unroot-them.html