This is from Howardforums.com. Winston25, one of the two guys who work(ed) for Motorola and gave us lots of advanced information on the Droid X (the other being Bill23 who changed his forum name to something with an X... like Xbernaut or something, and who says he no longer works for Motorola).
"Originally Posted by Winston25
No entirely true. The Milestone is still locked down but it has been overclocked with just root access. I tried it and it worked. I don't know how that guy figured it out, but it is impressive. You should be able to do a search and find the explanation. His method may work on other phones as well, but I haven't tested it.
I just did. I stand corrected.
Originally Posted by Tabe
Really? I read that the Milestone was OCd? And it has only been rooted... Can the X not be because it has the eFuse crap?
Natty_Lite: It has been. Apparently new parameters can be written to the kernel without actually flashing it. Seems like the only thing that people will be missing out on indefinitely, is the ability to flash new versions of the OS before they're pushed over the air. All the other hack related goodies like OC'ing, and WiFi tether appear to be in tact - Once the phone gets rooted of course
Originally Posted by ronaldheld
Thanks for that explanation, Natty_lite.
Natty_Lite: Seems my info wasn't entirely correct. The phone can be overclocked. However, it will still take some trial and error to figure just how high it can go while maintaining stability."