How to Overclock your UltraSPARC processor
by David A. Gutierrez	latest update: August 15,2003
written for Anysystem.com
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                                DISCLAIMER
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YOU CAN SERIOUSLY DISABLE YOUR SYSTEM AND RENDER IT UNUSABLE 
BY FOLLOWING THESE DIRECTIONS INCORRECTLY.
HECK, EVEN IF YOU FOLLOW THEM CORRECTLY, THERE'S NO TELLING 
IF I WROTE THEM UP INCORRECTLY. IN SHORT, DO NOT USE THESE 
DIRECTIONS UNLESS YOUR SYSTEM IS EXPENDABLE... AND IN NO WAY, 
SHOULD YOU ATTEMPT THIS ON A PRODUCTION MACHINE.
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IMPORANT:
Since raising clock speed generally raises heat, you should only do this on a system that meets the following requirements:

- can afford to crash/be fried (i.e. it is not running your town's emergency 911 system)
- is kept in a cool, air-conditioned area (i.e. data center environment)
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I have an Ultra 60 running 300MHz CPUs. I have only been able to get it running at 370MHz before it crashes on me.

In the following example, I am setting the clock speed to 350MHz. Adjust as necessary.
NOTE: Only raise the clock speed a reasonable amount (about 22%) ... If you try to run a 300MHz at 450MHz, it will give you garbage on the screen and crash.

ok> banner

Banner information will be displayed. Note the clock speed of the CPUs.

ok> also hidden
ok> d# 350 at-speed
ok> banner

Banner information is displayed again. Note the increase in clock speed.


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Couple of things I still have to test and/or document:

- does clock speed reset to normal after reset-all? if so, can you put these commands in nvramrc?
- if machine crashes from setting clock speed too high, you can reset to default by STOP+N on keyboard.
- how to increase clock speed, half MHz at a time by using the +cpu-speed command